Patent ID: 6487336
Filing Date: 2002-11-26
Classification: G02B

Abstract:
A device, comprising:an input optical terminal to transmit a plurality of input optical signals at different wavelengths; an optical multiplexer coupled to said input optical terminal and adapted to have a plurality of output optical terminals to separate said input optical signals at different wavelengths into said output optical terminals, respectively; a plurality of variable attenuators respectively coupled in said output optical terminals to respectively attenuate said optical signals in response to respective control signals so as to produce first attenuated signals; and an optical reflector coupled to said output optical terminals to receive and reflect said first attenuated signals back to said variable attenuators which generate second attenuated signals respectively traveling in said output terminals towards said optical multiplexer, wherein said optical multiplexer combines said second attenuated signals into said input optical terminal as output signals.