Configuration of ETDM 20 Gb/s optical transmitter / receiver and their characteristics

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(1)Ó¢^ÔHankook Kwanghak Hoeji, Volume 13, Number 4, August 2002. *V' ª 7 Oj Ï 20 Gb/s 7 ÇÁ>V~ B· 5 WË ï&. ªç Á*ÖÁ~7Á«* †. *¶Ûö 7Û¦ Ö &*7 FW &;ÿ 161 (2002j 3ú 14¢ Ar, 2002j 6ú 10¢ >; Ar) 20 Gb/s 7 *Ç Êj * 7 ÇVf >V¢ *V' ª 7 Ob B·~ ßWj G;~& . ß® 7 >V~ ² (19.906 GHz) ºÂ ²~ *j * >2Ë æ Ff çÏzB EX-OR ²¶¢ Ï NRZ-PRZ æ~Vf F*Ú êV¢ Ï 7& &Û" jV 5 îÊÞã &Û" jV¢ Jê, B·~&b, «'b >¦öB 1:2 7zB 10 Gb/s ^~ jÞ JN(BER)j G;~& . B·B ÇÁ>V¢ ç7 ÿ~ &j r, >V~ > 6êº BER 1Ü10 öB −26.2 dBmj ¾æÚî . "BÚ : optical transmitter/receiver, clock extraction circuit. −12. I.. B . II. 20 Gb/s. ¢>'b 7Û ÊöB *Ç Ïïj Ã&Êº O »öº ² B B~ 2Ëj <º ^ j ~¾ ~ 7RF *Ç~º 2Ë ª 7 O(WDM; Wavelength Division Multiplexing)" ¢ j6ö & ^~ * Ç ³ê¢ ¸ "º ª 7 O(TDM; Time Division Multiplexing) ®b, TDM Of 7/ 7j 7 ' O»b ~º 7' ª 7 O(OTDM; Optical Time Division Multiplexing)" *¶ ²¶¢ Ï~ >¯~º *V' ª 7 O(ETDM; Electrical Time Division Multiplexing)b ª > ® . ¾ B'b *Ç Ïï~ Ã&º B BF Bê O» ~ Ï &Ë VF' êf &Ï' G þ J>Ú TDM" WDM O '.® [>Ú Ú æ ® . V¢B *Ò TDM GöB j6 *Ç ³ ê¢ 40 Gb/s Ã&ÊV * K" þ ¢ V>b WDM VFj Ï~ r¢/ *Ç Êj *~V * ê ² ê¯> ® . ¢^öBº 40 Gb/s 7 *Ç Ê~ F¯' êB ¢ j6 20 Gb/s ETDM 7 ÇÁ>V¢ B·~&, ßWj G;~& . ÇÁ>Vº Êö ËO~ ÿ &Ë~ê '' ~¾~ (340 mmÜ265 mm) *ö *> î . ß® >¦öBº V Ò 5 7z¢ * j >' ºÂ :j ç7 Jê, B·~&, ºÂB (19.906 GHz) ^¢ Ï~ 10 Gb/s 7zB ^~ j ÚÎ 5 jÞ JNj G;~ B·B ÇÁ> V~ WËj ï&~& .. 7 ÇÁ>V~ W. ; 20 Gb/s TDM Êf ² Ç¦, ç¦, > ¦ ¾2 > ®b, þöBº ETDM Oj Ï~ 7 ÇVf >V¢ W~& . â 1ö 20 Gb/s 7 ÇV(20G OTX)¢ Ç¦~ VË Wê¢ ¾æÚî . Ç¦º *V' 7zV (multiplexer; MUX), ÿ ÃV, LiNbO *Sê; ¦ æ V 5 2Ë 1554.94 nm DFB .& J b W~&b, çÏ Ëj 2:1 MUX¢ B ¾^æ *¶ 5 7 ²¶¢ ~¾~ (20G OTX) *ö Ë~& . MUX~ ÂK ^ 20 Gb/s NRZ(nonreturn-to-zero) *V ^º ÿ ÃV¢ Û 5 V b Ã>Ú ¦ æV ¢ ÿ . ÿ ÃVf æV «K ãöº :ÚÊ ²¢ ã«~ æV~ DC ÿ·6j . > ®ê ~ &, .& J~ Nêö V ßW æz¢ BÚ~V * Nê BÚ ²¢ î *^B¢ Ï~ *~ & . â 2º f ? W ÇV ~ B ;çj ¾æÞ © . 3. p-p. [1-4]. [5-8]. â 1. 20 Gb/s 7 Ç¦~ VË Wê.. †. E-mail: [email protected] 295.

(2) 296. 7²æ B 13² B 4^,. j 8ú. 2002. â 2. B·B 20 Gb/s 7 ÇV (20G OTX).. >¦º 20 Gb/s 7 ^¢ *V ^ æ~~ Ã~ º ¦ª" 7z 5 V Ò jº (19.906 GHz) ^¢ ºÂ~º ¦ª, Ò 1:2 *V' 7zV (demultiplexer; DEMUX) W~&b, â 3ö 20 Gb/s 7 >V(20G ORX)¢ >¦~ VË Wj ¾æÚ î . >¦ö «K>º 20 Gb/s NRZ 7 ^º 7/* æ~V (DC Responsivity=0.65A/W@1550 nm), 7&(100 kHz~20 GHz) ÃV¢ ö 20 Gb/s NRZ *V ^ æ~B ê *K ªVV¢ Û ~¾º 20 Gb/s V ¶Ú~ Òö ² >, ¾^æ ~¾º ºÂ¦ö «KB . ß® 7/ * æ~Vº 3 dB 7' & 20 GHz ç æ~ 1550 nmöB 32.5 V/W PIN ;~ æ~V¢ ÒÏ ~& . Þ, þöBº DEMUX& «K V~ 6ê VË j ~ ®Ú º&' 6ê ²º *~æ p~b, DEMUX~ «K *ö «K V(20 Gb/s)~ > 6êf ¢Ò .Îj .~V * 7& ÃVf :ÚÊ ²¢ ã«~& . ºÂ ²º Wª ìº NRZ ^¢ Wª ÚÒB ~Ò RZ ^(pseudo return-to-zero; PRZ) æ~Êº NRZ-PRZ æ~V, Wªj ºÂ~V * F*Ú êV(dielectric resonator; DR) jVf î ÊÞã & Û" jV 5 ºÂB ^¢ Ã~V *. â 4. B·B 20 Gb/s 7 >V (20G ORX).. 7& ÃV W~& . â 4º >V~ B ; çj ¾æÞ © . III. 20 Gb/s. 7 ÇV 5 >V þÖ". 7 ^~ W ªÊ NZ BV(pulse pattern generator; PPG) ¦V ÂKB v j6~ 10 Gb/s NRZ *V ^(PRBS, 2 1)º 2:1 MUX¢ Û 20 Gb/s *V ^ 7z>, r PPGº 2:1 7zö jº 10 Gb/s Vf j MUXö B . 20 Gb/s 7 ÇVº MUX ÂKj Ï~ 20 Gb/s NRZ 7 ^¢ W~² >º, r ÇV ~ ÂK 7^¢ þ2ç J Êz* &V~B j â(eye opening) ·^~, ²7j(extinction ratio)& & & >ê æV~ ÿ·6j .~& . â 5ö 20 Gb/s 7 ÇV~ «ÁÂK ^ 20 Gb/s NRZ *V ^(â 5(a) ^)f 7 ^(â 5(b) ^)~ j ÚÎj ¾ æÚî . 7 ^~ « ÂKf 2.86 dBm, ²7jº 11 dB , j& Îv ¾ J ®rj {~& . 3.2. ^~ ºÂ 7F¢ Û *Ç>Ú N Vº >¦öB 7/* æ ~ ê 6ê 5 Ò>Ú ~* ê[~ ^ 7z>º " ;j ~² >º, r ·î~ V¢ Ò~V *B 3.1. 20 Gb/s NRZ 10 Gb/s. â 3. 20 Gb/s 7 >¦~ VË Wê.. 7.

(3) Ó¢^Ô*V' ª 7 Oj Ï 20 Gb/s 7 ÇÁ>V~ B· 5 WË ï& ªçÁ*Ö . â 5. (a) ÇV «K *V ^~ j ÚÎ. (b) ÇV ÂK 7 ^~ j ÚÎ.. º «K>º Vf ÿV& ¾ f ^& j>' , ¢ * ºÂf >¦~ "º VË 7 ~¾ . Þ, *Ç>Úê NRZ Vöº "2> Wª Ú Ò>Ú ®æ pV r^ö ÖF Wª B ^~ æ~ jº~, Ûç *K ²Î& 6 ®º > ç ÏzB ÷'²¶¢ Ï~ * Ï~ º Ë6 r^ö EX-OR ²¶¢ Ï . æ~ ê ^º Wªòj ºÂ~V * "2> ' öB jV¢ ~² >º, jV~ * O»ö V¢ ² PLL(phase-locked loop)j Ï Ëÿ; O" >ÿ jV ²¢ Ï Ob ¾2 > ® . PLLj Ï Ëÿ; O»f æV ßW Ö> ®î~ j áj > ® Ï &Ë ÷'² ²¶¢ Û ²;z > ® º Ë 6 ®b¾, ."2 &öBº B·~º ôf ÚJæ ® . Þ >ÿ; OöBº "2> 'ö V¢ * & Ë ²¶ ¢ææ &"2 &" "2 &b ¾*Úê . &"2 &öBº R, L, C¢ Ï ² ¾ SAW jV ÒÏ> ®b, ."2 &öBº :Ê;~ "2 ßW Ö> F*Ú DRj Ï~ & ¶ ~ ¸f Q 8j æò jV¢ *~ ® . þ~ ºÂ ²º >2Ë æ Ff NELÒ~ EX-OR(NLG 4003) ²¶¢ Ï NRZ-PRZ æ~V, 7& DR &Û" jV, 7& &Û" jV 5 7& ÃV W~&b, â 6ö B·B NRZ-PRZ æ~V~ «Á ÂK "2> ßWj ¾æÚî . â 6(a)º 7 >V~ NRZ-PRZ æ~Vö «K>º 20 Gb/s NRZ *V^~ "2 [9,10]. [11]. [12-14]. 297. â 6. (a) NRZ-PRZ æ~Vö «K>º 20 Gb/s NRZ ^~ "2> ßW. (b) NRZ-PRZ æ~V ÂK ^~ "2> ßW. 1. Coupled-line &Û" jV~ Jê Ò· Center Frequency Fractional Bandwidth Number of Coupled-line Sections Ripple Value Filter Response Characteristic Impedance Z0. 20 GHz 0.025 3 sections 0.5 dB Chebyshev 50 ohm. > Ê¿Þ"j ¾æÞ ©, â 6(b)º æ~VöB ÂKB ^~ "2> Ê¿Þ"j ¾æÞ © . ¦V æ~ ê ~ ^& "2> Wªj F~ ®rj r > ® . 7& &Û" jVº F*N 30 Trans-TechÒ~ : Ê; DRj Ï~&, êVº RogersÒ~ RT/duroid 5870 10 mil V6 *ö B·B îÊÞã ¢ö ~ V>î . 6 ;& ê"2>~ .j * DR ç[ ¦öº .³ . ¾Ò& J~>î . Þ, DR &Û" j Vº ßWç 7 Î Û" & º~æ ÊÒÚÊ ßWj BFÒ Ï'b 7&~ &Û" jV& B·>î . B·B &Û" jV~ Jê Ò ·f *~ 1" ?, RogersÒ~ RT/duroid 5870 10 mil V6 *ö Coupled-microstrip-lineb B·>î . â 7(a) º B·B DR &Û" jV~ 7& "2> w ßWj ¾æÞ ©, â 7(b)º DR &Û" jV~ 7& " 2> w ßWj ¾æÞ © . DR &Û" jVf î ÊÞã &Û" jV *Ú~ 7& "2> ßWf â 7(c)ö ¾æÚî . â 7(b)¦V B BF :f ? 7 Î Û"& ^~ 7 "2> &.

(4) 298. 7²æ B 13² B 4^,. j 8ú. 2002. â 8. (a) >¦öB 7/* æ~B ^~ j ÚÎ. (b) >¦~ ºÂ¦öB ºÂB ^. (c) 1:2 DEMUXöB 7zB 10 Gb/s V~ j. ÚÎ.. â 9. > 6ê ßW. â 7. (a) DR &Û" jV~ 7& "2> w ßW. (b) DR &Û" jV~ 7& "2> w ßW. (c) DR &Û" jV+Coupled-line &Û" jV~ " 2> w ßW.. öB Ò~ ®rj { > ®, º&'b î ÊÞã &Û" jV¢ Û"b ÊÒÚÊ ßW BF>îrj â 7(c)öB { > ® . Þ, ºÂ ²¢ Û ºÂB f V 6ê 5 7z¢ * 1:2 DEMUXö «K>º, r. ~ «K j òÊV * 7"2>& 20 7& ÃV¢ ÒÏ~& . â 8ö >¦ö «K >Ú 7 * æ~B 20 Gb/s NRZ *V ^(â 8(a) ^) f ºÂ¦¦V ºÂB ^(â 8(b) ^), Ò «'b 10 Gb/s 7zB ^(â 8(c) ^) ~ G; Ö" j ¾æÚî . 3.3. ¢ j6 20 Gb/s *Ç þ B·B 7 ÇVf >V~ WËj þ~V * * 7 ç¢ W~& . 7 ÇVöB WB 20 Gb/s NRZ. DEMUX GHz /.

(5) Ó¢^Ô*V' ª 7 Oj Ï 20 Gb/s 7 ÇÁ>V~ B· 5 WË ï& ªçÁ*Ö . 7 ^º 7 6Vf 7 *~ ÃV¢ ê, 7/* æ ~>, 10 Gb/s ^ Ò>î . þ WöBº > ¦¢ 7 *~ ÃV¦V DEMUXræ ;~~, 7 Ã V ö *~ 7 6V¢ Ï~ > 7 *Kj æz Êº O»b jÞ JN(bit error rate; BER)j G;~& . r 7/* æ~V «Kö ~º 7 *~ ÃV~ ÂK f 5 dBmb ;V . â 9ö ÇVf >V¢ ç 7 ÿ~ G; >6ê ßWj ¾æÚî, Ö" BER 1Ü10 öB −26.2 dBm~ Ö> > 6ê¢ áj > ®î . −12. IV.. Ö . ¢^öBº 10 Gb/s NRZ(PRBS 2 -1) ^¢ «³ ^ ~, *V' 7/ 7 Oj 'Ï 20 Gb/s 7 Ç V 5 >V¢ W~ WËj G;~& . ß®, ³ 7 *Ç Ê~ º² VF ºÂ ² *j * NRZ-PRZ æ~Vf 7& DR jV 5 7& & Û" jV¢ Jê~ B·~&b, ¢ Ï~ 20 Gb/s NRZ V¦V ^¢ ºÂ~& . 7 ÇVf >V¢ '' ~¾~ *~&, ' êê ßWj þ2ç J. Êz*¢ Û {~& . 7 ÇVf >V¢ ç7 Ö back-to-back Wj Û, B·B 7 ÇÁ>V~ W Ëj þ'b Ò~&b, Ö" BER 1Ü10 öB −26.2 dBm~ Ö> > 6ê¢ áj > ®î . z®Ú . þj Û B· 20 Gb/s ETDM 7 ÇÁ>V~ W O f ºê 40 Gb/s ETDM Ê~ Wöê 'Ï &Ë ©b .çB .. [4]. [5]. [6]. 7. [7]. −12. 6Ò~ &. þj * &æ Þ" z®Ú Ïª Æ~¢ " ç> ;Òþ, V^ ;Òþ, öãþ" ÇÒ^þþ 6Òãî .. ^^ò. [1] B. Zhu, S. N. Knudsen, L. E. Nelson, D. W. Peckham, M. O. Pedersen, and S. Stulz, “800 Gbit/s (80×10.664 Gbit/s) WDM transmission over 5200 km of fibre employing 100 km dispersion-managed spans,” Electron. Lett., vol. 37, no. 24, pp. 1467-1469, 2001. [2] G. Vareille, F. Pitel, and J. F. Marcerou, “3 Tbit/s (300× 11.6 Gbit/s) transmission over 7380 km using C+L band with 25 GHz channel spacing and NRZ format,” in OFC Conference 2001, Postdeadline Paper PD22, Anaheim, USA, 2001. [3] B. Bakhshi, M. F. Arend, M. Vaa, E. A. Golovchenko, D. Duff, H. Li, S. Jiang, W. W. Patterson, R. L. Maybach, and D. Kovsh, “1 Tbit/s (101×10 Gbit/s) transmission over. [8]. [9]. [10]. [11]. [12]. [13]. [14]. 299. transpacific distance using 28 nm C-band EDFAs,” in OFC Conference 2001, Postdeadline Paper PD21, Anaheim, USA, 2001. H. Suzuki, M. Fujiwara, N. Takachio, K. Iwatsuki, T. Kitoh, and T. Shibata, “12.5-GHz spaced 1.28-Tb/s (512-Channel ×2.5 Gb/s) super-dense WDM transmission over 320-km SMF using multiwavelength generation technique,” IEEE Photonics Tech. Lett., vol. 14, no. 3, pp. 405-407, 2002. M. Yoneyama, Y. Miyamoto, T. Otsuji, H. Toba, Y. Yamane, T. Ishibashi, and H. Miyazawa, “Fully electrical 40-Gb/s TDM system prototype based on InP HEMT digital IC technologies,” J. Lightwave Tech., vol. 18, no. 1, pp. 34-43, 2000. K. Ishikawa, K. Watanabe, H. Chiba, H. Suzuki, R. Takeyari, K. Ohhata, T. Tanoue, K. Hirata, T. Masuda, R. Hayami, K. Washio, and T. Harada, “40 Gbit/s optical transmitter and receiver using InP HBT and SiGe HBT ICs,” in ECOC 2000, Munich, Germany, vol. 1, pp. 89-90, 2000. B. Zhu, L. Leng, L. E. Nelson, Y. Qian, L. Cowsar, S. Stulz, C. Doerr, L. Stulz, S. Chandrasekhar, S. Radic, D. Vengsarkar, Z. Chen, J. Park, K. S. Feder, H. Thiele, J. Bromage, L. Gruner-Nielsen, and S. Knudsen, “3.08 Tbit/s (77× 42.7 Gbit/s) WDM transmission over 1200 km fibre with 100 km repeater spacing using dual C- and L-band hybrid Raman/erbium-doped inline amplifiers,” Electron. Lett., vol. 37, no. 13, pp. 844-845, 2001. Y. Zhu, W. S. Lee, C. Scahill, C. Fludger, D. Watley, M. Jones, J. Homan, B. Shaw, and A. Hadjifotiou, “1.28 Tbit/s (32×40 Gbit/s) transmission over 1000 km NDSF employing distributed Raman amplification and active gain flattening,” Electron. Lett., vol. 37, no. 1, pp. 43-45, 2001. K. Murata, T. Otsuji, T. Enoki, and Y. Umeda, “Exclusive OR/NOR IC for > 40 Gbit/s optical transmission systems,” Electron. Lett., vol. 34, no. 8, pp. 764-765, 1998. K. Murata and T. Otsuji, “A novel clock recovery circuit for fully monolithic integration,” IEEE Trans. Microwave Theory Tech., vol. 47, no. 12, pp. 2528-2533, 1999. J. H. Song, T. W. Yoo, J. H. Ko, C. S. Park, and J. K. Kim, “Design and characterization of a 10 Gb/s clock and data recovery circuit implemented with phase-locked loop,” ETRI Journal, vol. 21, no. 3, pp. 1-5, 1999. R. L. Rosenberg, C. Chamzas, and D. A. Fishman, “Timing recovery with SAW transversal filters in the regenerators of undersea long-haul fiber transmission systems,” J. Lightwave Tech., vol. LT-2, no. 6, pp. 917-925, 1984. P. Monteiro, J. N. Matos, A. Gameiro, and J. R. F. da Rocha, “10 Gbit/s timing recovery circuit using dielectric resonator and active bandpass filters,” Electron. Lett., vol. 28, no. 9, pp. 819-820, 1992. P. Monteiro, J. N. Matos, A. Gameiro, and J. R. F. da Rocha, “20 Gbit/s DR based timing recovery circuit,” Electron. Lett., vol. 30, no. 10, pp. 799-800, 1994..

(6) 300. 7²æ B 13² B 4^,. j 8ú. 2002. Configuration of ETDM 20 Gb/s optical transmitter/receiver and their characteristics Sang-Kyu Lim†, Hyunwoo Cho, Gapyoul Lyu, and Jong-Hyun Lee Optical Communications Department, Electronics and Telecommunications Research Institute, Daejeon 305-350, KOREA † E-mail: [email protected]. (Received March 14, 2002 ; revised manuscript received June 10, 2002). We developed an optical transmitter and receiver for an electrical time division multiplexed (ETDM) 20 Gb/s optical transmission system, and experimentally investigated their characteristics. Especially, the clock extraction circuit, which is a key component in realizing broadband optical transmission receivers, was realized by using an NRZ-to-PRZ converter implemented with a half-period delay line and an EX-OR, a high-Q bandpass filter using a cylindrical dielectric resonator, and a microstrip coupled-line bandpass filter. Finally, the bit-error-rate of demultiplexed 10 Gb/s electrical signal after back-to-back transmission was measured, and a high receiver sensitivity [−26.2 dBm for NRZ (27-1) pseudorandom binary sequence (PRBS)] was obtained Classification code : OC.010..

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