Patent ID: 7308169
Filing Date: 2007-12-11
Classification: G02B,H04B,H04J

Abstract:
1. An optical signal equalizer coupled between an output of an optical transmitter and an optical apparatus, a transmitter output signal having a degradation caused by an imperfection in the transmitter, the equalizer comprising: a first coupler for splitting the light from the output of the optical transmitter into two or more portions; a controllable interferometer unit having two or more arms, each arm receiving one portion, a second coupler for combining the portions received from the two or more interferometer arms; wherein at least one of said couplers has a variable coupling ratio, and the coupling ratio of the at least one of said couplers and the amount of delay in the controllable delay unit are adjusted to generate an equalized signal at the output of the second coupler, thereby mitigating said transmitter output signal degradation caused by the imperfection in the transmitter.