Title :
Adaptive echo canceller for full duplex data transmission system over an optical fiber
Author :
Lin Ru-Jian ; Wen-Jun, Huang ; Jian-Feng, Shen ; Gu Min
Author_Institution :
Adv. Commun. Labs., Shanghai Univ. of Sci. & Technol., China
Abstract :
Full duplex data transmission over a single fiber has been realized employing adaptive echo cancellation for crosstalk elimination. The system consists of LEDs and PIN/FET modules in symmetrical baseband operation. Two adaptive echo cancellers, memory compensation type, with a simple sign algorithm are connected to the receivers at both ends. With the present echo canceller it is possible to compensate even for distant reflection at the far-end connector and Rayleigh backscattering in the fiber. The adaptability enables the system adjust to any changes in connector reflectance. A pseudorandom sequence is used as dithering noise instead of the conventional uniformly distributed noise. It is proven both theoretically and experimentally that this innovation can improve the signal-to-residual noise ratio over 16 dB
Keywords :
data communication systems; echo suppression; optical communication equipment; optical fibres; optical links; PIN/FET modules; Rayleigh backscattering; adaptive echo cancellation; crosstalk elimination; dithering noise; far-end connector; full duplex data transmission; memory compensation; optical fiber; pseudorandom sequence; receivers; reflectance; reflection; sign algorithm; signal-to-residual noise ratio; symmetrical baseband operation; Acoustic reflection; Backscatter; Baseband; Connectors; Crosstalk; Data communication; Echo cancellers; FETs; Light emitting diodes; Noise cancellation;
Conference_Titel :
Singapore ICCS/ISITA '92. 'Communications on the Move'
Print_ISBN :
0-7803-0803-4
DOI :
10.1109/ICCS.1992.255144
