Optical receiver apparatus

Details Optical receiver apparatus Optical receiver apparatus

Filed on

1995-04-13

Date issued

1996-05-14

Examiner

Hellner, Mark

Patent Class

Optical: systems and elements

SubClass

Optical amplifier

SubSubClass

Optical fiber

Other Related Categories

359194, H01S 300

Type

Patent

Status

active

Patent number

055173519

Description

ABSTRACT:
Pumping light from a pumping laser diode is controlled by referring to both a peak value and a mark-space ratio value of an amplified signal. A peak value detecting circuit for the amplified signal light as well as a mark-space ratio detecting circuit for detecting the mark-space ratio are provided. The injection current to a semiconductor laser for pumping an erbium-doped optical fiber is controlled in accordance with a peak value when the mark-space ratio is in the vicinity of 0.5. When the mark-space ratio is beyond a predetermined range, for example 0.25 to 0.75, the injection current is fixed to a value obtained immediately before the mark-space ratio exceeds this range, to select the level fixing operation. Since the level fixing operation is carried out when the mark-space ratio is outside the predetermined range, the amplified signal light does not become excessive even when the mark-space ratio fluctuates. It thus becomes possible to prevent the detection failure of the received clock due to the breakdown of the receiving photodiode or optical noise.

REFERENCES:
patent: 5335109 (1994-08-01), Heidemann
patent: 5467219 (1995-11-01), Ushirozawa

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