Long-span repeaterless transmission systems with optical amplifiers using pulse width management

• Published in: Journal of lightwave technology Vol. 16; no. 6; pp. 977 - 985
• Main Authors: Sano, A., Miyamoto, Y., Kataoka, T., Hagimoto, K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.1998; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Miscellaneous; Optical amplifiers; Optical and optoelectronic circuits; Optical pulse compression; Optical receivers; Optical sensors; Optical transmitters; Pulse amplifiers; Repeaters; Semiconductor optical amplifiers; Space vector pulse width modulation; Stimulated emission; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Optical receiver; Optical amplifier; Pulse width; Management; Bit error rate; Optical telecommunication
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/50.681453

This paper proposes pulse width management in order to extend the repeater spacings of repeaterless transmission systems with optical amplifiers. First, the dependency of receiver sensitivity on duty ratio, receiver response, and fiber dispersion is clarified by numerical analysis. Next, the calculation results of sensitivity as a function of signal format and receiver basedband response are verified experimentally. Moreover, we show that pulse width management which uses return-to-zero (RZ) format with large duty ratio (/spl sim/0.7) at the transmitter and pulse compression at the receiver increases the repeater gain by /spl sim/4.5 dB compared to conventional systems employing nonreturn-to-zero (NRZ) format. Record repeater spacing of 300 km is realized at 10 Gb/s by utilizing pulse width management.