40-Gbit/s ETDM Channel Technologies for Optical Transport Network

Abstract We review recent progress and the future of 40-Gbit/s electrical time division multiplexed (ETDM) channel technologies for the optical transport network (OTN), where optical technologies, including high-speed ETDM channel transmission and wavelength division multiplexing (WDM), dramatically enhance network flexibility while reducing transport node cost as well as transmission cost. The 40 Gbit/s channel has recently been specified to be one of the optical channels in OTN. A new digital frame for the optical channels [optical channel transport unit (OTU)] was introduced for the network node interface of OTN in International Telecommunication Union-Telecommunication (ITU-T) standard. The specified data bit rates are 2.7 Gbit/s (OTU1), 10.7 Gbit/s (OTU2), and 43.0 Gbit/s (OTU3). These OTU frames have additional overhead bytes that support the network management overhead for OTN and out-of-band forward error correcting (FEC) codes. We discuss the feasibility and impact of the OTU3 frame in terrestrial networks. A newly developed 43-Gbit/s OTN line terminal prototype that confirms the feasibility of 43-Gbit/s ETDM channels and the OTU3 management capability is discussed. As a guide to the evolution of OTN, modulation formats for 43Gbit/s-based DWDM transmission are described for long distance application with the total capacity over one terabit per second.

[1]  Osaake Nakajima,et al.  Twenty-Gbit/s signal transmission using a simple high-sensitivity optical receiver , 1992 .

[2]  H. Toba,et al.  320 Gbit/s WDM repeaterless transmission using fully encoded 40 Gbit/s optical duobinary channels with dispersion tolerance of 380 ps/nm , 2000 .

[3]  Taiichi Otsuji,et al.  40-Gbit/s TDM transmission technologies based on ultra-high-speed ICs , 1999 .

[4]  C. Schulien,et al.  A 1:4 demultiplexer for 40 Gb/s fiber-optic applications , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[5]  Satoru Okamoto,et al.  Network performance and integrity enhancement with optical path layer technologies , 1994, IEEE J. Sel. Areas Commun..

[6]  A. Sano,et al.  320 Gbit/s (8/spl times/40 Gbit/s) WDM transmission over 367 km with 120 km repeater spacing using carrier-suppressed return-to-zero format , 1999 .

[7]  Y. Kobayashi,et al.  Forward error correcting codes in synchronous fiber optic transmission systems , 1997 .

[8]  N. S. Bergano,et al.  32/spl times/20 Gb/s transmission over trans-Atlantic distance (6200 km) with 31% spectral efficiency , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[9]  Tomoyoshi Kataoka,et al.  Limitations and challenges of single-carrier full 40-Gbit/s repeater system based on optical equalization and new circuit design , 1997, Proceedings of Optical Fiber Communication Conference (.

[10]  Y. Umeda,et al.  Monolithic integration technology using InP-based HEMTs and a uni-traveling-carrier-photodiode for over 40 Gbit/s digital OEIC , 2000, Conference Proceedings. 2000 International Conference on Indium Phosphide and Related Materials (Cat. No.00CH37107).

[11]  Yutaka Miyamoto,et al.  40 Gbit/s monolithic digital OEIC composed of unitravelling-carrier photodiode and InP HEMTs , 2000 .

[12]  Y. Imai,et al.  A 40-Gbit/s optical repeater circuits using InAlAs/InGaAs HEMT digital IC chip set , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[13]  Yoshihisa Suzuki,et al.  Novel network fiber to manage dispersion at 1.55 /spl mu/m with combination of 1.3 /spl mu/m zero dispersion single mode fiber , 1997 .

[14]  H. Toba,et al.  40 Gbit/s L-band transmission experiment using SPM-tolerant carrier-suppressed RZ format , 1999 .

[15]  Hiroji Masuda Review of wideband hybrid amplifiers , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[16]  T. Imai,et al.  Automatic compensation technique for timewise fluctuating polarisation mode dispersion in in-line amplifier systems , 1994 .

[17]  N. Shimizu,et al.  A 40-Gbit/s monolithic digital OEIC module composed of uni-traveling-carrier photodiode and InP HEMT decision circuit , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[18]  H. Toba,et al.  320 Gbit/s WDM field experiment using 40 Gbit/s ETDM channels over 176 km dispersion-shifted fibre with nonlinearity-tolerant signal format , 2000 .

[19]  K. Noguchi,et al.  Low-voltage and broadband Ti:LiNbO/sub 3/ modulators operating in the millimeter wavelength region , 1996, Optical Fiber Communications, OFC..

[20]  H. Toba,et al.  1.2 Tbit/s (30/spl times/42.7 Gbit/s ETDM optical channel) WDM transmission over 376 km with 125 km spacing using forward error correction and carrier-suppressed RZ format , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[21]  Kazuo Hagimoto,et al.  Dispersion-compensation-free 40-Gbit/s X 4-channel WDM transmission experiment using zero-dispersion-flattened transmission line , 1998 .

[22]  Yutaka Miyamoto 4O-Gbit/s transport system: its WDM upgrade , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).