Patent ID: 11929826
Assignee: INFINERA CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical device, comprising:
a substrate;
2N inputs on the substrate, N being an integer, each of the 2N inputs including a respective one of 2N waveguides, each of which extending to an edge of the substrate, and each of the 2N waveguides carrying a respective one of 2N optical signals, each of the 2N optical signals including an in-phase component and a quadrature component;
N lasers provided on the substrate;
first N optical hybrid circuits, each of which receiving a respective one of first N optical signals of the 2N optical signals from a corresponding one of first N waveguides of the 2N waveguides and a first portion of light output from a respective one of the N lasers, each of the first N optical hybrid circuits providing a respective one of first N groups of mixing products;
second N optical hybrid circuits, each of which receiving a respective one of second N optical signals from a corresponding one of second N waveguides and a second portion of the light output from a respective one of the N lasers, each of the second N optical hybrid circuits providing a respective one of second N groups of mixing products, the first N and second pluralities of optical hybrid circuits being provided on the substrate,
N optical attenuators;
N optical splitters provided on the substrate, each of the N optical splitters being coupled to a respective one of the N lasers,
wherein the first portion of the light output from a respective one of the N lasers is supplied from a first output of a corresponding one of the N optical splitters, the second portion of the light output from a respective one of the N lasers is supplied from a second output of a corresponding one of the N optical splitters, and a third portion of the light output from a respective one of the N lasers is supplied from a third output of a corresponding one of the N optical splitters to a respective one of N optical attenuators.