Patent ID: 11968035
Assignee: ACACIA COMMUNICATIONS, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. A system comprising:
an integrated optical multiplexer, comprising:
a plurality of optical inputs configured and constructed to receive input optical signals;
two or more stages of multiplexing in a cascading configuration, wherein the two or more stages of multiplexing are divided into wavelength stages and a last stage; and
a polarization beam combiner,, wherein each of the wavelength stages combine subsets of input optical signals by wavelength, the last stage combines input optical signals by polarization using the polarization beam combiner, and at a combined output of the integrated optical multiplexer a first subset of the input optical signals have a different polarization than a second subset of the input optical signals, wherein one or more of the wavelength stages comprise one or more mach-zehnder interferometers, wherein at least one of the mach-zehnder interferometers is configured to flatten a passband.