Optical wavelength-division-muitiplexing (WDM) is attractive to realize large capacity optical communication systems and networks [1]-[6]. The wideband amplification of WDM signal is indispensable to increase the transmission capacity. Over 20 nm wideband transmission experiments were reported employing wideband optical fiber amplifiers [4], [6], The gain imbalance of such wideband amplifiers is a serious problem because it accumulates across the amplifier stages; the level difference between channels grows with stage number. As a result, transmission distance was restricted by signal-to-noise ratio (OSNR) degradation and non-liner effects. Because, optical gain equalizers (GEQ) are indispensable to compensate the gain imbalance, several optical gain equalizers have been studied recently including a Mach-Zehender filter [1], a fiber grating [3], and a lattice type optical circuit [7], The lattice type optical circuit is especially attractive due to its precise tunability and the ability it provides to design the transmittance with wideband equalization range.

© 1996 Optical Society of America

PDF Article
More Like This
Optimum Gain Equalization for WDM In-line Multistage Amplifier Systems

Mitsunori Fukutoku, Kazuhiro Oda, and Hiromu Toba
SaB4 Optical Amplifiers and Their Applications (OAA) 1995

10 Gbit/s × 10-channel WDM transmission experiment over 1200 km with repeater spacing of 100 km without gain equalization or pre-emphasis

Seiji Yoshida, Shigeru Kuwano, Noboru Takachio, and Katsushi Iwashita
TuD6 Optical Fiber Communication Conference (OFC) 1996

20-nm signal bandwidth after 147-amplifier chain using long-period gain-equalizers

Takao Naito, Takafumi Terahara, Naomasa Shimojoh, Toshiki Tanaka, Terumi Chikama, and Masuo Suyama
ThO4 Optical Fiber Communication Conference (OFC) 1998


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access Optica Member Subscription