Abstract

Laser frequency drift and close channel spacing in dense WDM networks can cause linear crosstalk.¹ We propose to use the least mean squares (LMS) algorithm² to adaptively cancel the crosstalk in an IM/DD receiver. This cancellation relaxes the laser frequency stabilization requirement and/or reduces the minimum channel spacing. A similar use of LMS was made for bundles of twisted pairs in Ref. 3. This algorithm assumes that the detected outputs of adjacent channels are available. This assumption would be valid for an optoelectric integrated circuit containing a grating⁴ feeding an array of photodetectors.

© 1992 Optical Society of America