| 摘要 |
A device for use in an optical telecommunicationS network is provided, which comprises a first Polarization Independent Coupler with Bragg-Evanescent Coupler grating-PINC-BEC (14) having an input for receiving channels comprising wavelength bands lambda ( lambda 1-n), where n is a number greater than 2, and a plurality of outputs. The PINC-BEC has a first Bragg grating (18) for selectively isolating a desired one of the input channels. The device further comprises a second PINC-BEC (16) having an input for receiving the remaining channels from an output of the first PINC-BEC, and further filtering the desired one of the input channels from the input to the second PINC-BEC. Preferably, a second Bragg grating (20) is disposed between the first and second PINC-BECs to improve the isolation of the selected channel.
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