An all-optical network using semiconductor laser amplifiers as optical repeaters is very attractive because it provides bit-free long-haul optical transmission lines. However, when frequency-division-multiplexed (FDM) signals are incident on the laser amplifier, undesired lights are generated by nondegenerate four-wave mixing (NDFWM) between neighboring channels, so that transmission characteristics of the coherent system are degraded. The authors report the results of three channel coherent FSK transmission experiments with inline laser amplifiers and describe the influence of NDFWM on the system performance. It is shown that in the multistage amplifier system, undesired light power due to NDFWM accumulates, and this causes serious degradation. The influence of NDFWM on the system penalty is reduced when each carrier has a widely spread spectrum.
|Number of pages||1|
|Publication status||Published - 1 Dec 1989|
|Event||Optical Fiber Communication Conference: Summaries of Papers - Houston, TX, USA|
Duration: 6 Feb 1989 → 9 Feb 1989
|Conference||Optical Fiber Communication Conference: Summaries of Papers|
|City||Houston, TX, USA|
|Period||6/02/89 → 9/02/89|