Electronics and Telecommunications Research Institute

Seung-Kwan Kim

Hyo-Hoon Park

Sun-Hyok Chang

Jyung-Chan Lee

Jin-Soo Han

Won-Kyoung Lee

Moo-jung Chu

Hee-Sang Chung

Bo-Hun Choi

Moo-Jung Chu

A method for realizing, in a fiber amplifier with three stages of amplifiers, automatic gain control in which a constant gain is obtained when channels are varied, and automatic level control in which a constant output per channel is obtained when a light power is varied because of variations in span loss. A light power or another light power of a specific wavelength is monitored to determine when variations in these light powers take place, current values of pump laser diodes appropriate for an input is read from a lookup table, and pump laser diodes are driven. During this operation, a pump power of the first stage amplifier is constantly maintained, and those of the second or third stage amplifier are controlled.

Fiber amplifier and control method thereof

An improved long wavelength-band EDFA (L-band EDFA) is disclosed. The EDFA includes an input terminal for receiving signal light, a pumping unit for pumping a 1,530 nm wavelength band pumping light, a WDM coupler for multiplexing the signal light and the pumping light, and an EDF pumped by a 1,530 nm wavelength band pumping light for amplifying the signal light. Compared with conventional 1,480 nm pumping, the EDFA pumped by 1,530 nm band pumping have about two times higher power conversion efficiency.

L-band erbium-doped fiber amplifier pumped by 1530 nm-band pump

Growing community of inventors

Daejeon, South Korea

Seung-Kwan Kim