OPTICAL FIBER MACH-ZEHNDER INTERFEROMETER FABRICATED WITH ASYMMETRIC COUPLERS

摘要

An asymmetric optical fiber Mach-Zehnder interferometerhas first and second optical fibers connected at a firstcoupling region and a second coupling region. The first andsecond optical fibers form two interfering arms between thefirst and second coupling regions. To form the asymmetry, thepropagation constant in a portion of the first optical fiber inone of the coupling regions differs from the propagationconstant in a portion of the second optical fiber in thatcoupling region. The asymmetric structure provides 30 dBisolation over a greater wavelength span.