Patent ID: 6310718
Filing Date: 2001-10-30
Classification: G01M,H01S,H04B,H04J

Abstract:
An optical amplifying apparatus, comprising:a first optical amplifier for amplifying light having a first wavelength .lambda.1 which is inputted from an optical input unit, and for outputting the amplified light from an optical output unit; anddetour means for selectively entering said light having the first wavelength .lambda.1 into said first optical amplifier, and for selectively not entering light having a second wavelength .lambda.2 into said first optical amplifier,wherein said detour means comprises:a first wavelength division multiplexer arranged at a pre-stage of said optical input unit, for outputting said light having the first wavelength .lambda.1 which is inputted from a first port to a second port, and also for outputting said light having the second wavelength .lambda.2 which is inputted from said first port to a third port;a second wavelength division multiplexer arranged at a post stage of said optical output unit, for outputting said amplified light which is inputted from a fifth port to a fourth port, and also for outputting said light having the second wavelength .lambda.2 which is inputted from said fourth port to a sixth port;a detour transmission line for connecting said third port of said first wavelength division multiplexer to said sixth port of said second wavelength division multiplexer; anda second optical amplifier for amplifying light having said second wavelength .lambda.2,wherein said detour transmission line is connected through said second optical amplifier.