Frequency multiplex optical communication system

Abstract

Abstract PURPOSE:To attain long range transmission by providing a network equalizer cancelling the transmission loss varied with a signal optical frequency between an optical transmission line and an optical receiver. CONSTITUTION:Signal lights of plural optical transmitters 1 with different frequency are multiplexed and the result is sent to an optical transmission line 2 and the optical receiver 3 receives the signal light sent via the line 2 with demultiplexing. A network equalizer 4 amplifying or attenuating the signal light to cancel the difference from the transmission loss caused by the change in the transmission loss of the optical transmission line 2 depending on the frequency of the signal light is provided between the optical transmission line 2 and the optical receiver 3. Thus, the signal light level inputted to the optical receiver 3 is made constant independently of the frequency and the limit of the transmission distance extension caused by the deviation from the permissible input range of the optical receiver 3 is excluded.

Inventors

• 👤 Yoshito Onoda
• 👤 Terumi Chikama
• 👤 Tetsuya Kiyonaga

Bibliographic Details