Patent ID: 6219177
Filing Date: 2001-04-17
Classification: H01S

Abstract:
An optical amplifying apparatus comprising:a pump light outputting unit for outputting pump light;an optical amplifier for amplifying an inputted optical signal with said pump light outputted from said pump light outputting unit, and outputting an amplified optical signal;an output constant control unit for controlling said pump light outputting unit such that a level of said amplified optical signal amplified by said optical amplifier is constant;an optical input monitoring unit for monitoring an optical input to said optical amplifier;a pump light level setting unit for setting an optical level of said pump light on the basis of a result of the optical input monitoring from said optical input monitoring unit;a pump light monitor control unit for monitoring a level of said pump light from said pump light outputting unit, and controlling said pump light outputting unit such that said monitored output level of said pump light is stabilized at said optical level set by said pump light level setting unit;an input disconnection detecting unit for detecting whether said optical input is disconnected or not on the basis of a result of the optical input monitoring from said optical input monitoring unit; andan operation control switching unit for switching a control mode for pump light outputted from said pump light outputting unit to said optical amplifier so that said pump light outputting unit operates in any one of control modes among an output constant control mode by said output constant control unit, a pump light control mode by said pump light monitor control unit, said pump light control mode is a mode in which an output level of said pump light from said pump light outputting unit is controlled such that said monitored output level of said pump light is stabilized at said optical level set by said pump light level setting unit on the basis of the result of monitoring by said optical input monitor unit, and a stop control mode to stop an output of said pump light from said pump light outputting unit, such that an optical output level of said pump light outputted from said pump light outputting unit is constant at the time of power feeding or an optical amplifying function recovery.