Patent ID: 6961492
Filing Date: 2005-11-01
Classification: G02B,G02F,H04B

Abstract:
1. A tunable chromatic optical signal dispersion compensator comprising three cascaded Mach-Zehnder interferometers, MZIs, a first MZI including a fixed 50/50 coupler for receiving an input optical signal, a second MZI including a first adjustable coupler that is shared with the first MZI and a second adjustable coupler that is shared a third MZI, the second MZI further including a half-wave plate positioned across the midpoints of the two path lengths of the second MZI so as to exchange the TE and TM polarizations of the optical signals passing through the two path lengths, the third MZI including a fixed 50/50 coupler for outputting a dispersion-adjusted output optical signal and wherein said first and second shared adjustable couplers are adjusted with equal coupling ratios using a single control signal to provide adjustable dispersion compensation to the output signal.