Patent ID: 6819481
Filing Date: 2004-11-16
Classification: H04J

Abstract:
Apparatus for use in a bidirectional optical wavelength division multiplexed transmission system in which first direction odd-numbered channels are interleaved with opposite direction even-numbered channels comprisingfirst and second terminals, and a gain block inserted between the two terminals for amplifying both odd-numbered channel signals propagating from said first to said second terminal and even-numbered channel signals propagating from said second terminal to said first terminal, characterized in that the gain block includes an interleaver means for selectively transmitting odd-numbered channel signals propagating codirectionally from said first to said second terminal and for selectively transmitting even-numbered channel signals propagating codirectionally from said second terminal to said first terminal, said interleaver means positioned to block counterdirectional crosstalk, codirectional crosstalk and roundtrip gain of said channels.