Patent ID: 7822298
Filing Date: 2010-10-26
Classification: G02B,G02F

Abstract:
1. An apparatus, comprising: first and second Mach-Zehnder interferometers, each Mach-Zehnder interferometer having input and output optical couplers and two internal optical arms, each optical arm connecting one output of the input optical coupler to a corresponding input of the output optical coupler, the output optical coupler of the first Mach-Zehnder interferometer being the input optical coupler of the second Mach-Zehnder interferometer; and wherein the input optical coupler of the first Mach-Zehnder interferometer is configured to transmit one polarization component of the light to two of the outputs thereof and to transmit another polarization component of the light to substantially only one of the outputs thereof in response to receiving said light at an input thereof.