Patent ID: 6871022

Claim:
A method of demultiplexing a first optical signal at first wavelength and a second optical signal at a second wavelength comprising: providing a light beam comprising the first optical signal and the second optical signal; reflecting a first portion of the light beam to create a first sub-beam; transmitting a second portion of the light beam to create a second sub-beam; delaying the second sub-beam by a first duration; reflecting a first portion of the first sub-beam; transmitting a second portion of the first sub-beam; reflecting a first portion of the delayed second sub-beam; transmitting a second portion of the delayed second sub-beam; combining the reflected first portion of the first sub-beam with the transmitted second portion of the delayed second sub-beam to form a third sub-beam; combining the reflected first portion of the delayed second sub-beam with the transmitted second portion of the first sub-beam to form a fourth sub-beam; delaying the fourth sub-beam by a second duration; reflecting a first portion of the third sub-beam; transmitting a second portion of the third sub-beam; reflecting a first portion of the delayed fourth sub-beam; transmitting a second portion of the delayed fourth sub-beam; combining the reflected first portion of the third sub-beam with the transmitted second portion of the delayed fourth sub-beam to form a fifth sub-beam; and combining the reflected first portion of the delayed fourth sub-beam with the transmitted second portion of the third sub-beam to form a sixth sub-beam, wherein the fifth sub-beam comprises a substantial majority of the first optical signal and the sixth sub-beam comprises a substantial majority of the second optical signal.