公开(公告)号：JPH0362022A

公开(公告)日：1991-03-18

申请号：JP10633790

申请日：1990-04-20

Applicant: STC PLC

Inventor： RICHIYAADO EDOWAADO ITSUPUWAAS ,  KEBIN KURISUTOFUAA BAIRON ,  ROBAATO ANSONII BEIKAA ,  NAIJIERU TEIRAA

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/094 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H01S3/17 ,  H01S5/00 ,  H01S5/04 ,  H01S5/0683 ,  H01S5/50 ,  H04B10/17

Abstract: PURPOSE: To perform the gain control of optical amplifier of ASE having the center at 1.535μm by using the signal of 1.551μm so as to form the base of a gain control loop. CONSTITUTION: This device is composed of an erbium-doped fiber 1, pump laser 2, wavelength multiplexer 3 for superimposing the output of the pump laser and an input optical signal, pump/signal demulti-plexer 5 for dividing an output signal and a section B of small ASE at 1.5μm, output port 6 for optical signal, band filter 7, detection part 8, amplifier 9 and feedback loop 10. Then, the output of the feedback loop 10 is impressed to the pump laser 2, and pump output power is changed so as to maintain a fixed gain, namely, the fixed strength of natural discharge. Thus, the amplifier gain at 1.535μmA can be kept constant by feeding back a change in the strength of ASEB having the window center at 1.551μm.