Module Merges 11.5-Gb/s NRZ/RZ Converter, Driver

Electronic Design Electronic Design Europe Defense Electronics Power Electronics Source ESB Mobile Dev & Design Engineering TV

CONNECT WITH MWRF

Reprints

Printer-Friendly

Email this Article

RSS

Font Size

What's This?

[Components]
Module Merges 11.5-Gb/s NRZ/RZ Converter, Driver
Integration of the data converter and high-speed driver spares optical system integrators the task of optimizing performance with dissimilar components.

Paolo Tabacco | ED Online ID #7757 | March 2004

Long-haul optical communications systems rely on a variety of electrical and optical components to send and receive high-rate data. Among these components, data converters and modulators represent important functions that are also technically difficult to integrate. Fortunately, iTerra Communications (Palo Alto, CA) has developed its model iT6130 (see table), a single surface-mount module that combines a non-return-to-zero (NRZ)/return-to-zero (RZ) converter and a modulator driver for long-haul applications to 11.5 Gb/s.

Modulation techniques that extend the distance between optical amplifiers can reduce hardware costs in long-haul optical communications systems. RZ modulation, the leading technique for long-haul optical transmissions, has traditionally been difficult to implement in practical systems. At present, optical RZ pulses can be generated by separate cascaded Mach-Zehnder modulators driven by an NRZ data stream for one section and a clock pulser for the second section. The approach requires precise control of amplitude and phase, as well as separate microwave amplifiers for the two sections.

A simpler approach which can reduce the number of components and optical loss would be to generate an electrical RZ signal and drive a single Mach-Zehnder optical modulator. Two of the fundamental components required for this technique are a converter that electrically transforms an NRZ signal, typically coming from a multiplexer, to an RZ signal, and a microwave amplifier that drives an optical modulator. These two devices are combined in the iT6130 NRZ-to-RZ converter/modulator driver (Fig. 1), sparing the optical system integrator component matching, tuning, and optimization.

Combining these two functions produces significant benefits for system integrators. Optical modulator drivers are notoriously sensitive to the input from the amplifier that drives them, and matching the two is extremely difficult if the signal is RZ rather than NRZ because of its different spectral shape. The modulator drivers themselves are equally sensitive to the signal conditions at their inputs. The iT6130 eliminates the device selection, design, and optimization required to accommodate these demands, because all required functions are contained within the module and optimized to work with each other. The result is a data converter/driver amplifier that is smaller and lighter than a unit built from discrete parts and typically delivers better performance. The system integrator need be concerned only with the digital interface at the iT6130's input and the output interface. The latter interface is simplified in the iT6130 by incorporating a DFF core in the digital RZ converter. A user need only adjust the NRZ data and clock phase margin which can be as broad as 320 deg.

The iT6130 is a complete subassembly for generating a high-level RZ signal from clock and NRZ data inputs. Its output is adjustable from 4 to 7 VDC p-p and tailored for use with lithium-niobate (LiNo) modulators. Maximum data rate is 11.5 Gb/s. The module consists of a single-chip GaAs monolithic converter and a hybrid traveling-wave FET amplifier plus ancillary components mounted on a substrate with high thermal conductivity.

The subassembly has internal DC regulators and filtering that eliminate the need for power-supply sequencing and accommodate even noisy, poorly regulated DC inputs. If interfacing agility or timing-dependent jitter optimization is required, the iT6130 provides the desired phase shift with active phase shifters, the only manufacturer yet to do so. This approach was chosen because cascaded passive phase shifters produce loss that must be compensated for with amplification, which increases cost and complexity.

RZ modulation enables link extension because of its inherently higher peak power for a given input signal. If the average optical power is constant, RZ modulation will produce twice the peak power of NRZ modulation (but require twice the bandwidth). Consequently, RZ modulation produces a theoretical 3-dB advantage in receiver sensitivity (reduced in practice by 0.5 dB because of increased shot noise caused by greater peak power in the receiver). While other factors complicate this rule, an RZ-coded signal can still allow much longer span lengths than NRZ.

However, implementing RZ modulation creates engineering problems. All components, from RZ converter to receive filter, must handle twice the bandwidth of an NRZ signal at the same data rate. "Off-the-shelf" RZ driver amplifiers are rare and expensive because they must accommodate a driving signal that forces their input stage to operate in a different region of their transistor current-voltage (I-V) characteristics than would an NRZ signal. This situation requires considerable engineering time for an optimal solution. The drop-in approach of the iT6130 should be welcome by all designers who have themselves wrestled with optimization and integration.

RZ signals were initially achieved with optical methods, in which electro-optical modulators were cascaded, and the pulse was generated in the optical domain using an optical filter. This approach results in a large, complex device that is expensive to produce, draws considerable current, and generates loss in the second optical modulator that requires a higher-power laser for compensation, but achieves very low jitter. Manufacturers have worked to enhance electrical RZ generation in recent years, since the method requires only a single optical modulator, modulator driver, and bias controller, to reduce system costs by $3000 to $5000. Only one driver amplifier is required for reduced power dissipation.

With "electrical RZ," the NRZ data from the multiplexer is converted to an RZ signal, amplified, and sent to the optical modulator as a 5-to-7-VDC signal. The output signal must have a flat zero-level (rail) and low jitter, which is a difficult challenge. Jitter performance of the RZ modulator integrated within the iT6130 represents some of the best jitter characteristics yet achieved, producing eye diagrams that are virtually indistinguishable from those produced by optical techniques (Fig. 2). Jitter at an output of 7 VDC is 3.5 ps p-p.

Two versions of the iT6130 are available: an SMA module and a two-chip surface-mount version. iTerra Communications, 2440-A Embarcadero Way, Palo Alto, CA 94303; (650) 424-1937, FAX: (650) 424-1938, e-mail: Mahvish_bari@iter rac.com, Internet: www.iterrac.com.

Reprints

Printer-Friendly

Email this Article

RSS

Font Size

What's This?

Reader Comments

eSOcqA http://jf4Gqm84hEQsl0dy2Pu3b.org

gregory -March 04, 2010 (Article Rating:

)

Jonny was here

Arwtvpaj -February 27, 2010 (Article Rating:

)

Very Good Site

Zhwmghbw -February 27, 2010 (Article Rating:

)

Fokygsei -February 27, 2010 (Article Rating:

)

this is be cool 8)

Xacxcmmr -February 27, 2010 (Article Rating:

)

I'm happy very good site

Nwkcyaot -February 27, 2010 (Article Rating:

)

magic story very thanks

Yqbwkexo -February 27, 2010 (Article Rating:

)

magic story very thanks

Yqbwkexo -February 27, 2010 (Article Rating:

)

Cvddvgzq -February 27, 2010 (Article Rating:

)

Best Site Good Work

Abptiwle -February 27, 2010 (Article Rating:

)

Best Site Good Work

Stcmyafl -February 27, 2010 (Article Rating:

)

Wonderfull great site

Fofvpzuz -February 27, 2010 (Article Rating:

)

Gloomy tales

Ajqhcrqr -February 27, 2010 (Article Rating:

)

I love this site

Mocaiumd -February 27, 2010 (Article Rating:

)

perfect design thanks

Ovujuxzy -February 27, 2010 (Article Rating:

)

perfect design thanks

Rivybukz -February 27, 2010 (Article Rating:

)

This site is crazy :)

Zmfqiosg -February 27, 2010 (Article Rating:

)

It's serious

Oqvzrkuy -February 27, 2010 (Article Rating:

)

this post is fantastic

Qmcfhbde -February 26, 2010 (Article Rating:

)

Punk not dead

Kfipbhuw -February 26, 2010 (Article Rating:

)

Cool site goodluck :)

Kwofkizw -February 26, 2010 (Article Rating:

)

Gloomy tales

Tlmrveth -February 26, 2010 (Article Rating:

)

real beauty page

Tklvmxoz -February 26, 2010 (Article Rating:

)

this post is fantastic

Ajavaglq -February 26, 2010 (Article Rating:

)

Excellent work, Nice Design

Gldliapn -February 26, 2010 (Article Rating:

)

i'm fine good work

Pdgagygl -February 26, 2010 (Article Rating:

)

this post is fantastic

Lcxnfsfb -February 26, 2010 (Article Rating:

)

Excellent work, Nice Design

Glhmnrjc -February 26, 2010 (Article Rating:

)

Gloomy tales

Mesusrsj -February 26, 2010 (Article Rating:

)

It's funny goodluck

Lrpodvxx -February 26, 2010 (Article Rating:

)

This site is crazy :)

Edmxceib -February 26, 2010 (Article Rating:

)

Gloomy tales

Lkqstahr -February 26, 2010 (Article Rating:

)

Best Site Good Work

Rxnlnmks -February 26, 2010 (Article Rating:

)

This site is crazy :)

Edmxceib -February 26, 2010 (Article Rating:

)

good material thanks

Gqgtlxsk -February 25, 2010 (Article Rating:

)

Punk not dead

Vaxpiska -February 25, 2010 (Article Rating:

)

this is be cool 8)

Fbimtovo -February 25, 2010 (Article Rating:

)

Best Site Good Work

Ptldquci -February 25, 2010 (Article Rating:

)

magic story very thanks

Xtzkscom -February 25, 2010 (Article Rating:

)

perfect design thanks

Bqjypfua -February 25, 2010 (Article Rating:

)

this post is fantastic

Wxqxnqfx -February 25, 2010 (Article Rating:

)

very best job

Mkzqwgui -February 25, 2010 (Article Rating:

)

Cool site goodluck :)

Vcugxnfy -February 25, 2010 (Article Rating:

)

Best Site Good Work

Obvjvxew -February 25, 2010 (Article Rating:

)

this post is fantastic

Wxqxnqfx -February 25, 2010 (Article Rating:

)

Jonny was here

Kbyabjmf -February 25, 2010 (Article Rating:

)

Excellent work, Nice Design

Qqeydrrw -February 25, 2010 (Article Rating:

)

Best Site Good Work

Zuptnmpb -February 24, 2010 (Article Rating:

)

magic story very thanks

Sqspjyjx -February 24, 2010 (Article Rating:

)

Very interesting tale

Orniinxt -February 24, 2010 (Article Rating:

)

Cool site goodluck :)

Gzihpubs -February 24, 2010 (Article Rating:

)

magic story very thanks

Vkgkixbz -February 24, 2010 (Article Rating:

)

Jonny was here

Lzzdmfuj -February 24, 2010 (Article Rating:

)

very best job

Mpzgewgx -February 24, 2010 (Article Rating:

)

Punk not dead

Wztvvera -February 24, 2010 (Article Rating:

)

magic story very thanks

Hlnhpooj -February 24, 2010 (Article Rating:

)

this is be cool 8)

Rbqmdydn -February 24, 2010 (Article Rating:

)

It's serious

Xdjlosxr -February 24, 2010 (Article Rating:

)

I love this site

Jlbpibkl -February 24, 2010 (Article Rating:

)

Jonny was here

Bxjzhgnx -February 24, 2010 (Article Rating:

)

real beauty page

Fmhhvbji -February 24, 2010 (Article Rating:

)

Excellent work, Nice Design

Mhndkaxg -February 24, 2010 (Article Rating:

)

It's serious

Xdjlosxr -February 24, 2010 (Article Rating:

)

Hello good day

Qysaxrbs -February 23, 2010 (Article Rating:

)

real beauty page

Oxppbvdy -February 23, 2010 (Article Rating:

)

Best Site good looking

Vasmgzck -February 23, 2010 (Article Rating:

)

This site is crazy :)

Qgcyiqxc -February 23, 2010 (Article Rating:

)

Jonny was here

Ocawxjru -February 23, 2010 (Article Rating:

)

good material thanks

Hbbrdygs -February 23, 2010 (Article Rating:

)

Wonderfull great site

Uvmyestm -February 23, 2010 (Article Rating:

)

Best Site Good Work

Zmjmczze -February 23, 2010 (Article Rating:

)

very best job

Kypzgqbb -February 23, 2010 (Article Rating:

)

i'm fine good work

Fzkjfxyo -February 23, 2010 (Article Rating:

)

Cool site goodluck :)

Ksebufye -February 23, 2010 (Article Rating:

)

Very interesting tale

Efygjfps -February 23, 2010 (Article Rating:

)

Punk not dead

Vqldchke -February 23, 2010 (Article Rating:

)

this post is fantastic

Uzupxjly -February 23, 2010 (Article Rating:

)

this post is fantastic

Mxinavyr -February 23, 2010 (Article Rating:

)

Very Good Site

Iptjgxgq -February 23, 2010 (Article Rating:

)

this post is fantastic

Ahfammjp -February 23, 2010 (Article Rating:

)

this is be cool 8)

Byeegboh -February 23, 2010 (Article Rating:

)

Very funny pictures

Peflvvib -February 23, 2010 (Article Rating:

)

Cool site goodluck :)

Ddumyimm -February 23, 2010 (Article Rating:

)

Fdednyea -February 23, 2010 (Article Rating:

)

Gloomy tales

Xpnqgfdf -February 23, 2010 (Article Rating:

)

It's serious

Twrqiaab -February 23, 2010 (Article Rating:

)

Wonderfull great site

Zhhvvgsa -February 22, 2010 (Article Rating:

)

Jonny was here

Ipeoezas -February 22, 2010 (Article Rating:

)

very best job

Lvkxvjrr -February 22, 2010 (Article Rating:

)

magic story very thanks

Imccjygi -February 22, 2010 (Article Rating:

)

very best job

Hcbwsslh -February 22, 2010 (Article Rating:

)

Jonny was here

Otjkzmwa -February 22, 2010 (Article Rating:

)

perfect design thanks

Ichjumpq -February 22, 2010 (Article Rating:

)

very best job

Wjoxabck -February 22, 2010 (Article Rating:

)

Excellent work, Nice Design

Uwtqindq -February 22, 2010 (Article Rating:

)

Jonny was here

Ecwmsjig -February 22, 2010 (Article Rating:

)

Very Good Site

Qlixqxrm -February 22, 2010 (Article Rating:

)

I'm happy very good site

Xoislfnk -February 22, 2010 (Article Rating:

)

Very Good Site

Rlrbdyen -February 22, 2010 (Article Rating:

)

Jonny was here

Klfvlrxp -February 22, 2010 (Article Rating:

)

good material thanks

Senlubcs -February 22, 2010 (Article Rating:

)

Good crew it's cool :)

Ausjpvbu -February 22, 2010 (Article Rating:

)

It's funny goodluck

Qcsbxequ -February 22, 2010 (Article Rating:

)

Very Good Site

Rsnhvuwp -February 22, 2010 (Article Rating:

)

Best Site Good Work

Jxnosvgn -February 22, 2010 (Article Rating:

)

It's serious

Lrritxfl -February 22, 2010 (Article Rating:

)

Punk not dead

Ggjneiqr -February 21, 2010 (Article Rating:

)

Thanks funny site

Pgujwpzb -February 21, 2010 (Article Rating:

)

Very funny pictures

Vewwwnys -February 21, 2010 (Article Rating:

)

Jonny was here

Qfdiowya -February 21, 2010 (Article Rating:

)

Punk not dead

Tkstzbxh -February 21, 2010 (Article Rating:

)

Thanks funny site

Gxlahdzq -February 21, 2010 (Article Rating:

)

Punk not dead

Mkmwhpoy -February 21, 2010 (Article Rating:

)

Gloomy tales

Xaeouusq -February 21, 2010 (Article Rating:

)

Best Site Good Work

Juliosrd -February 21, 2010 (Article Rating:

)

Xfsdnqqv -February 21, 2010 (Article Rating:

)

Jonny was here

Zjqqbbxd -February 21, 2010 (Article Rating:

)

Very interesting tale

Fpjhezkr -February 21, 2010 (Article Rating:

)

Very interesting tale

Fpjhezkr -February 21, 2010 (Article Rating:

)

I love this site

Xouoyvlh -February 21, 2010 (Article Rating:

)

Tgvsoabx -February 21, 2010 (Article Rating:

)

this post is fantastic

Ftsvtncv -February 21, 2010 (Article Rating:

)

this post is fantastic

Ftsvtncv -February 21, 2010 (Article Rating:

)

Gloomy tales

Sknhsxtb -February 21, 2010 (Article Rating:

)

Wonderfull great site

Voxefiks -February 21, 2010 (Article Rating:

)

Cool site goodluck :)

Lwrgpswq -February 21, 2010 (Article Rating:

)

Cool site goodluck :)

Xjrgbvmt -February 21, 2010 (Article Rating:

)

this post is fantastic

Jxwhgxwb -February 20, 2010 (Article Rating:

)

Punk not dead

Tckxwnxx -February 20, 2010 (Article Rating:

)

perfect design thanks

Rlpivfph -February 20, 2010 (Article Rating:

)

Thanks funny site

Rwmipqvr -February 20, 2010 (Article Rating:

)

Thanks funny site

Gjdtjlgh -February 20, 2010 (Article Rating:

)

This site is crazy :)

Ftrltojo -February 20, 2010 (Article Rating:

)

Best Site good looking

Bywjdfmo -February 20, 2010 (Article Rating:

)

Excellent work, Nice Design

Knzmbirs -February 20, 2010 (Article Rating:

)

Cool site goodluck :)

Uhbzhtmk -February 20, 2010 (Article Rating:

)

Cool site goodluck :)

Uyfhbpur -February 20, 2010 (Article Rating:

)

Cool site goodluck :)

Mjgdbebr -February 20, 2010 (Article Rating:

)

Thanks funny site

Exoiuhui -February 20, 2010 (Article Rating:

)

It's serious

Pfxljcxj -February 20, 2010 (Article Rating:

)

Best Site Good Work

Jltpocdr -February 20, 2010 (Article Rating:

)

Punk not dead

Zbayfdiq -February 20, 2010 (Article Rating:

)

Cool site goodluck :)

Ktahbdun -February 20, 2010 (Article Rating:

)

Jonny was here

Ohzdtsjx -February 20, 2010 (Article Rating:

)

Very Good Site

Tqyqppjq -February 20, 2010 (Article Rating:

)

Wonderfull great site

Gmayvmuv -February 19, 2010 (Article Rating:

)

I'm happy very good site

Sueofegd -February 19, 2010 (Article Rating:

)

Best Site good looking

Ctphnxcr -February 19, 2010 (Article Rating:

)

It's funny goodluck

Fioqklev -February 19, 2010 (Article Rating:

)

Good crew it's cool :)

Fxfzdxcu -February 19, 2010 (Article Rating:

)

perfect design thanks

Qbhypyeo -February 19, 2010 (Article Rating:

)

PiPbsWt

OmPMYLfe -February 16, 2010 (Article Rating:

)

GnlTMF http://www.cRk2bdPqQls602mIa4bgo.com

samuel -February 04, 2010 (Article Rating:

)

<url>http://skan-telo.narod2.ru|?????? ??????????? ???????? ?????? ??????</url> <url>http://skan-telo.narod2.ru|???????? ?????? ?????? ??????? ?????????</url> <url>http://skan-telo.narod2.ru|???????? ?????? ?????? ?? ????????</url> <url>http://skan-telo.narod2.ru|???? ?????? ?????? ??????</url> <url>http://skan-telo.narod2.ru|??????? ?????? ?????? ?????? ???????</url> <url>http://skan-telo.narod2.ru|xxx ??????? ?????? ?????? ??????</url> <url>http://skan-telo.narod2.ru|????????? ?????? ???????? ?????? ??????</url> <url>http://skan-telo.narod2.ru|??????????? ???????? ?????? ?????? ???????</url> <url>http://skan-telo.narod2.ru|?????? ???????? ?????? ??????</url> <url>http://skan-telo.narod2.ru|?????? ???????? ?????? ?????? ??????</url>

eloelo -January 12, 2010 (Article Rating:

)

YHu4bj http://fh82nGsQk0fQsn3Ldap1f.com

albert -January 06, 2010 (Article Rating:

)

nqNMMw http://cry82Nqp94NsW0sl2VvqhJ4m.com

tomphson -January 06, 2010 (Article Rating:

)

<url>http://tvojgay.net.ua/|?????????? ??? ????</url> <url>http://tvojgay.net.ua/map.html|??? ??????????</url> <url>http://tvojgej.net.ua/|??????? ??? ????? ??????</url> <url>http://tvojgej.net.ua/map.html|??? ????? ???? ????????</url> <url>http://geyfinder.net.ua/|??? ????? ????</url> <url>http://geyfinder.net.ua/map.html|?????? ??? ?????</url>

?????????? ??? ??? -January 03, 2010 (Article Rating:

)

?????????? ??? ??? -January 03, 2010 (Article Rating:

)

?????????? ??? ??? -January 03, 2010 (Article Rating:

)

<url>http://skaner-sex.narod2.ru|????????? ??????</url> <url>http://skaner-sex.narod2.ru|???? ?????? ??? ?????????? </url> <url>http://skaner-sex.narod2.ru|??????? ????????? ?????? ????????????? ???????</url> <url>http://skaner-sex.narod2.ru|??????? ????????? ?????? ??? ????? </url> <url>http://skaner-sex.narod2.ru|????????? ??????? ??????? ????????? </url> <url>http://skaner-sex.narod2.ru|????????? ?????? ??????? </url> <url>http://skaner-sex.narod2.ru|????????? ???????</url> <url>http://skaner-sex.narod2.ru|????????? ?????? ????????????? ?????????????</url> <url>http://skaner-sex.narod2.ru|????????? ?????? ?????????? ???????</url> <url>http://skaner-sex.narod2.ru|???? ?????? ??? ?????????? </url> <url>http://skaner-sex.narod2.ru|????????? ????????? ?????? ?? ???????</url> <url>http://skaner-sex.narod2.ru|????????? ?????? ????????</url> <url>http://skaner-sex.narod2.ru|????????? ?????? jar</url> <url>http://skaner-sex.narod2.ru|????????? ?????? ?????? ?????? </url> <url>http://skaner-sex.narod2.ru|??????? ????????? ?????? ?????????????? ?????? </url>

asdqasd -January 02, 2010 (Article Rating:

)

<url>http://scanermob.narod2.ru|??????? ?????? ?????? ??????</url> <url>http://scanermob.narod2.ru| ?????? ???? ??? ???????? ???????</url> <url>http://scanermob.narod2.ru|????????????? ?????? ?? ??????? ???????</url> <url>http://scanermob.narod2.ru|??????? ????????? ????????? ??????</url> <url>http://scanermob.narod2.ru|?????? ??????</url> <url>http://scanermob.narod2.ru|??????? ????????? ?????? ?????? ??????</url> <url>http://scanermob.narod2.ru|????????? ?????? ??????? ??????????</url> <url>http://scanermob.narod2.ru|????????? ?????? ?????? ??????? ?????????</url> <url>http://scanermob.narod2.ru|??????? ?????? ??? ????????????? ??????</url> <url>http://scanermob.narod2.ru|??????? ????????? ?????? ????????????? ???????</url>

scanermob -December 30, 2009 (Article Rating:

)

<url>http://sexcamru.narod2.ru|?????? ???? ???</url> <url>http://sexcamru.narod2.ru|??????????? ???? ???</url> <url>http://sexcamru.narod2.ru|????? ????? ???</url> <url>http://sexcamru.narod2.ru|???? ??? ???</url> <url>http://sexcamru.narod2.ru|???? ??? ???</url> <url>http://sexcamru.narod2.ru|???? ????? ???</url> <url>http://sexcamru.narod2.ru|??? ???</url> <url>http://sexcamru.narod2.ru|???????????? ???? ??? ?????</url> <url>http://sexcamru.narod2.ru|???????????? ? ???????? ??? ?????</url> <url>http://sexcamru.narod2.ru|???????????? ? ?????? ??? ?????</url> <url>http://sexcamru.narod2.ru|???????????? ??? ?????</url>

asd -December 30, 2009 (Article Rating:

)

asd -December 30, 2009 (Article Rating:

)

<url>http://lesbisexx.narod2.ru|????????? ???????? ?????????</url> <url>http://lesbisexx.narod2.ru|?????????? ????? ?????????</url> <url>http://lesbisexx.narod2.ru| ????????? ????? ?????????</url> <url>http://lesbisexx.narod2.ru|????????? ?????????</url> <url>http://lesbisexx.narod2.ru| ????????? ?????????? ?????????</url> <url>http://lesbisexx.narod2.ru|??????? ????????? ?????????</url> <url>http://lesbisexx.narod2.ru|???? ????? ????????? ?????????</url> <url>http://lesbisexx.narod2.ru| ?????????? ????? ??????? ?????????</url> <url>http://lesbisexx.narod2.ru|???????? ????????? ????? ?????? ?????????</url> <url>http://lesbisexx.narod2.ru|????????? ?????? ???????? ?????????</url>

asda -December 29, 2009 (Article Rating:

)

asda -December 29, 2009 (Article Rating:

)

asda -December 28, 2009 (Article Rating:

)

Very funny pictures

Tgoxkxkz -December 25, 2009 (Article Rating:

)

Very funny pictures

Tgoxkxkz -December 25, 2009 (Article Rating:

)

<url>http://world-of-love.ru/forum/member.php?u=70765|????? ???|????? sms</url> <url>http://www.stroiteli.info/member.php?u=3145|????? ???|????? sms</url> <url>http://www.mastercity.ru/vforum/member.php?u=74062|????? ???|????? sms</url> <url>http://www.stroiteli.info/member.php?u=3147|??????? ????? ???????|???????? ??????? ?????</url> <url>http://www.mastercity.ru/vforum/member.php?u=74067|??????? ????? ???????|???????? ??????? ?????</url> <url>http://world-of-love.ru/forum/member.php?u=70766|??????? ????? ???????|???????? ??????? ?????</url>

lkasm -December 23, 2009 (Article Rating:

)

<url>http://elitsex1.narod2.ru|??? ??????? ??? ?????</url> <url>http://elitsex1.narod2.ru|??? ?????</url> <url>http://elitsex1.narod2.ru|????? ?????? ???? ???? ????????? </url> <url>http://elitsex1.narod2.ru|sex ???? ???? ????????? </url> <url>http://elitsex1.narod2.ru|???? ???? ????????? ????????????</url> <url>http://elitsex1.narod2.ru|???? ????????? </url> <url>http://elitsex1.narod2.ru|?????????? ????? ???? ????????? </url> <url>http://elitsex1.narod2.ru|??????? ????? ???? ????????? </url> <url>http://elitsex1.narod2.ru|??????? ????? ???? ????????? </url> <url>http://elitsex1.narod2.ru|???? ???? ????????? ???????</url> <url>http://elitsex1.narod2.ru|???? ???? ?????????</url> <url>http://elitsex1.narod2.ru|???? ????????? ??? ???????????? ?????</url> <url>http://sexelastele.narod2.ru|?????????? ???? ???? ?????????</url> <url>http://sexelastele.narod2.ru|??? ??????? ??? ?????</url> <url>http://sexelastele.narod2.ru|???? ???? ????????? ????????????</url> <url>http://sexelastele.narod2.ru|???? ????????? ???? ? ????????</url> <url>http://sexelastele.narod2.ru|sex ???? ???? ?????????</url> <url>http://sexelastele.narod2.ru|????? ?????? ???? ???? ?????????</url> <url>http://sexelastele.narod2.ru|??????? ????? ???? ?????????</url> <url>http://sexelastele.narod2.ru|???? ????????? ??? ?????????? ?????</url> <url>http://sexelastele.narod2.ru|???? ???? ?????????</url> <url>http://sexelastele.narod2.ru|???? ??????? ??????</url> <url>http://sexelastele.narod2.ru|?????????? ??? ?????</url> <url>http://sexelastele.narod2.ru|???? ????? ?????????</url>

elitsex -December 23, 2009 (Article Rating:

)

<url>http://maturesexx.narod2.ru|???? ??????? ??????</url> <url>http://maturesexx.narod2.ru|??????? ?????????? ??????</url> <url>http://maturesexx.narod2.ru| ???? ??????? ???</url> <url>http://maturesexx.narod2.ru|???????? ????? ??????</url> <url>http://maturesexx.narod2.ru|???? ??????? ?????</url> <url>http://maturesexx.narod2.ru|???? ? ???????? ?????????</url> <url>http://maturesexx.narod2.ru|???? ? ???????? ????? ??????</url> <url>http://maturesexx.narod2.ru|???????? ???? ? ????????</url> <url>http://maturesexx.narod2.ru|??????? ???</url> <url>http://maturesexx.narod2.ru|??????? ?????</url>

asduk -December 20, 2009 (Article Rating:

)

<url>http://skazka-russ.narod2.ru|????????? ??????? ???????</url> <url>http://skazka-russ.narod2.ru|???????? ??????????? ?????? </url> <url>http://skazka-russ.narod2.ru|????????? ?????? ??????????? ?????? </url> <url>http://skazka-russ.narod2.ru|????????? ?????? ????????? ????</url> <url>http://skazka-russ.narod2.ru|?????? ??????? ????????? ????</url> <url>http://skazka-russ.narod2.ru| ????? ??????? ???????</url> <url>http://skazka-russ.narod2.ru|?????? ???????????? ??????</url> <url>http://skazka-russ.narod2.ru|????? ????? ?????? ?????</url> <url>http://skazka-russ.narod2.ru|??????? ????? ?????</url> <url>http://skazka-russ.narod2.ru|????? ??? ????? ??????</url>

qwdzxc -December 20, 2009 (Article Rating:

)

<url>http://litll-sex.narod2.ru/1|???? ????? ?????????</url> <url>http://litll-sex.narod2.ru/1|???????? ???? ?????</url> <url>http://litll-sex.narod2.ru/1|????? ????????</url> <url>http://litll-sex.narod2.ru/1|?????????? ??????</url> <url>http://litll-sex.narod2.ru/1|????????? ?????</url> <url>http://litll-sex.narod2.ru/1|????? ?????????? ??????? </url> <url>http://litll-sex.narod2.ru/1|????? ????? ?????????? </url> <url>http://litll-sex.narod2.ru/1|?????????? ????? ?????????? </url> <url>http://litll-sex.narod2.ru/1|???? ???? ?????? </url> <url>http://litll-sex.narod2.ru/2|????? ????? ??????????</url> <url>http://litll-sex.narod2.ru/2|??????? ???? ??????</url> <url>http://litll-sex.narod2.ru/2|????? ???? ??????</url>

ikajsk -December 19, 2009 (Article Rating:

)

ikajsk -December 19, 2009 (Article Rating:

)

ikajsk -December 19, 2009 (Article Rating:

)

<url>http://sexuar.narod2.ru|????? ??????????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??????????? ????????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??????????? ??? ??? ????????</url> <url>http://sexuar.narod2.ru|???? ????? ??????????? ??? ???</url> <url>http://sexuar.narod2.ru|??????????? ???????? ????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??? ??? ??????????? ???????</url> <url>http://sexuar.narod2.ru|????? ???? ??????????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ?????? ??? ??? ???????????</url> <url>http://sexuar.narod2.ru|??????? ????? ??????????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??????????? ????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??????????? ??? ???</url> <url>http://sexuar.narod2.ru|????? ??? ??? ??????????? ???????</url> <url>http://sexuar.narod2.ru|?????? ???????? ??? ??? ???????</url> <url>http://sexuar.narod2.ru|????? ????? ???????? ??? ??? </url>

asdqwfz -December 16, 2009 (Article Rating:

)

<url>http://sex-bez-sms.narod2.ru|??? ????? ? ?????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ?????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ? ????</url> <url>http://sex-bez-sms.narod2.ru|????? ? ????? ???????</url> <url>http://sex-bez-sms.narod2.ru|????? ??? ????? ??????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ? ?????</url> <url>http://sex-bez-sms.narod2.ru|??? ???????? ?????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ?????? ????????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ?????</url> <url>http://sex-bez-sms.narod2.ru|??? ????? ????????????</url>

asdqw -December 15, 2009 (Article Rating:

)

<url>http://www.igoo.com/forums/member.php?u=337651|Miley Cyrus Nude</url> <url>http://www.igoo.com/forums/member.php?u=337651|Miley Cyrus Naked</url> <url>http://www.igoo.com/forums/member.php?u=337651|Miley Cyrus Sextape</url>

MileyCyrusNude -December 14, 2009 (Article Rating:

)

<url>http://www.grouprecipes.com/people/mileycyrusnude|Miley Cyrus Nude</url> <url>http://www.grouprecipes.com/people/mileycyrusnude|Miley Cyrus Naked</url> <url>http://www.grouprecipes.com/people/mileycyrusnude|Miley Cyrus Sextape</url>

Miley Cyrus Nude -December 06, 2009 (Article Rating:

)

Miley Cyrus Nude -December 05, 2009 (Article Rating:

)

Hello good day

Miygnysm -November 19, 2009 (Article Rating:

)

Hi! iwmmdOV

MOxdapr -November 17, 2009 (Article Rating:

)

Hi! ofbLYBQ

YufFhtf -November 17, 2009 (Article Rating:

)

comment6

Nthdzdmp -November 16, 2009 (Article Rating:

)

comment5

Eccbhtqw -November 16, 2009 (Article Rating:

)

comment6

Hktktpdc -November 16, 2009 (Article Rating:

)

comment6

Huqtkprn -November 16, 2009 (Article Rating:

)

comment1

Wrsvxlqi -November 15, 2009 (Article Rating:

)

comment4

Bzeiuypi -November 15, 2009 (Article Rating:

)

comment3

Wwgkxrrg -November 15, 2009 (Article Rating:

)

comment1

Rnrzwwvt -November 15, 2009 (Article Rating:

)

comment3

Wwgkxrrg -November 15, 2009 (Article Rating:

)

comment6

Kpgkbfmi -November 15, 2009 (Article Rating:

)

comment2

Wdyqtkvn -November 15, 2009 (Article Rating:

)

comment2

Utmojjpl -November 15, 2009 (Article Rating:

)

comment6

Wktuekpl -November 15, 2009 (Article Rating:

)

comment1

Fzvtpvnb -November 14, 2009 (Article Rating:

)

comment2

Lnyjisya -November 13, 2009 (Article Rating:

)

comment3

Ixcgovvn -November 13, 2009 (Article Rating:

)

comment1

Wroqrovj -November 13, 2009 (Article Rating:

)

comment2

Rjdtboqd -November 13, 2009 (Article Rating:

)

comment4

Pnlkoevn -November 13, 2009 (Article Rating:

)

comment4

Qqmyxzaf -November 12, 2009 (Article Rating:

)

comment6

Jduakrhz -November 12, 2009 (Article Rating:

)

comment6

Rdbqwnwq -November 12, 2009 (Article Rating:

)

comment4

Vpngjiuu -November 12, 2009 (Article Rating:

)

comment5

Vjlvomuf -November 12, 2009 (Article Rating:

)

comment6

Iztiqqeb -November 12, 2009 (Article Rating:

)

comment5

Drvcavec -November 12, 2009 (Article Rating:

)

comment6

Byyvcbsx -November 12, 2009 (Article Rating:

)

comment2

Bdpslsjt -November 12, 2009 (Article Rating:

)

comment2

Eonnrrju -November 12, 2009 (Article Rating:

)

comment2

Cawgtkzh -November 12, 2009 (Article Rating:

)

comment4

Lbfyxkfv -November 11, 2009 (Article Rating:

)

comment2

Ydkrlcej -November 11, 2009 (Article Rating:

)

comment3

Cijwnlif -November 11, 2009 (Article Rating:

)

comment3

Cijwnlif -November 11, 2009 (Article Rating:

)

comment1

Edxhzdsp -November 11, 2009 (Article Rating:

)

comment3

Rfqmnagp -November 11, 2009 (Article Rating:

)

comment3

Uepjbdxb -November 11, 2009 (Article Rating:

)

comment2

Mjgfdndf -November 11, 2009 (Article Rating:

)

comment6

Gmmjrbnu -November 10, 2009 (Article Rating:

)

comment4

Xpaatxkk -November 10, 2009 (Article Rating:

)

comment4

Xpaatxkk -November 10, 2009 (Article Rating:

)

comment1

Ukdeurfm -November 10, 2009 (Article Rating:

)

comment3

Jqmltqys -November 10, 2009 (Article Rating:

)

comment6

Sbmxupxz -November 10, 2009 (Article Rating:

)

comment3

Jqmltqys -November 10, 2009 (Article Rating:

)

comment3

Avgdxlio -November 09, 2009 (Article Rating:

)

comment6

Uydneeds -November 09, 2009 (Article Rating:

)

comment1

Ocwarlhu -November 09, 2009 (Article Rating:

)

comment6

Iyfelkwq -November 09, 2009 (Article Rating:

)

comment3

Idztronh -November 09, 2009 (Article Rating:

)

comment4

Xwawqxzj -November 08, 2009 (Article Rating:

)

comment2

Aawtkdlx -November 08, 2009 (Article Rating:

)

comment2

Kmlkmrnj -November 08, 2009 (Article Rating:

)

comment2

Ssajggbi -November 08, 2009 (Article Rating:

)

comment6

Rejbeqas -November 07, 2009 (Article Rating:

)

comment6

Brecaumv -November 07, 2009 (Article Rating:

)

comment1

Qukymjyo -November 07, 2009 (Article Rating:

)

comment2

Xmnyxlcp -November 07, 2009 (Article Rating:

)

comment1

Eqozwvao -November 07, 2009 (Article Rating:

)

comment1

Eqozwvao -November 07, 2009 (Article Rating:

)

comment2

Olxgnjfu -November 06, 2009 (Article Rating:

)

comment3

Pycruccj -November 06, 2009 (Article Rating:

)

comment4

Wsznmmtp -November 06, 2009 (Article Rating:

)

comment6

Iklivkrm -November 06, 2009 (Article Rating:

)

comment3

Tgfejbzu -November 05, 2009 (Article Rating:

)

comment6

Wrvjwtqs -November 05, 2009 (Article Rating:

)

comment6

Lvzayzwl -November 05, 2009 (Article Rating:

)

magic story very thanks

Gnmihmiy -October 30, 2009 (Article Rating:

)

<url>http://www.dontstayin.com/members/pamela-anderson-nude|Carmen Electra Nude</url>

kjxyakq -October 18, 2009 (Article Rating:

)

JVF0AP http://xSwjQwnf48jmNfl40fh9Bs.biz

mikky -September 20, 2009 (Article Rating:

)

16k4M1 http://obk7W1mQkfiVvap7dGsp.net

margo -September 20, 2009 (Article Rating:

)

gmJn1p http://djg8Dnw3NxU82k0Skg.com

joseph -September 19, 2009 (Article Rating:

)

QALnmf Gra7noI59Unral92Bb7wf

daria -August 18, 2009 (Article Rating:

)