Patent ID: 6535670
Filing Date: 2003-03-18
Classification: G02B

Abstract:
An optical transmitter and receiver module for de-multiplexing a multi-wavelength optical signal into at least an optical signal of one wavelength band, and for receiving and transmitting the optical signal, said optical transmitter and receiver module comprising:input/output and output wave guides wherein the input/output wave guide carries first and second wavelength bands and is configured to output the first wavelength band and to reflect the second wavelength band, and the output wave guide carries the reflected second wavelength band; a transmit/receive wave guide for transmitting and receiving the first wavelength band output from the input/output wave guide; a first substrate made of a cleavable crystal, having a cleavage plane, for supporting the input/output and output wave guides which intersect each other at a portion on the cleavage plane from which the input/output and output wave guides extend at an equal angle with respect to a normal line on said cleavage plane; an interference filter in contact with said cleavage plane on the portion of intersection of the input/output and output wave guides of said first substrate; and a second substrate made of the cleavable crystal having another cleavage plane in contact with said interference filter, for supporting the transmit/receive wave guide having receiver and transmitter wave guides which extend from a vicinity of said portion of intersection and are separated from each other.