Abstract

Soliton puise transmission has great potential for use in realizing a high speed OTDM system of more than 10 Gbit/s [1]. A soliton-based transmission at 20 Gbit/s over 8,1 00 km has been successfully achieved by incorporating fibers with both anomalous and normal GVD as this reduces the average GVD [2]. This technique is based on the principle of the dispersion-allocated soliton which enables us to construct soliton systems using already installed optical fibers [3] [4]. Bergano et al. reported a 5 Gbit/s ×20 channel NRZ pulse transmission over 9100 km [5]. If high speed WDM soliton transmission can be realized, it will be very useful for a future transoceanic system. WDM soliton transmission has recently been reported by using a sliding filter method ( 10 Gbit/s×8 channels) [6] and a synchronous modulation method (10 Gbit/s×4 channels) [7]. When the in-line modulation method is used, it is highly advantageous to increase the bit rate as it is similar to laser mode-locking at an ultrahigh repetition rate.

© 1996 Optical Society of America