US 11,929,826 B2
Optical modules having an improved optical signal to noise ratio
Jeffrey T. Rahn, Sunnyvale, CA (US); Fred A. Kish, Jr., Palo Alto, CA (US); Michael Reffle, Center Valley, PA (US); Peter W. Evans, Mountain House, CA (US); and Vikrant Lal, Sunnyvale, CA (US)
Assigned to Infinera Corporation, San Jose, CA (US)
Filed by Infinera Corporation, Annapolis Junction, MD (US)
Filed on Nov. 13, 2018, as Appl. No. 16/189,221.
Application 16/189,221 is a continuation of application No. 15/814,346, filed on Nov. 15, 2017.
Claims priority of provisional application 62/422,031, filed on Nov. 15, 2016.
Prior Publication US 2019/0280798 A1, Sep. 12, 2019
Int. Cl. H04B 10/61 (2013.01); H04B 10/079 (2013.01); H04B 10/50 (2013.01); H04J 14/02 (2006.01); H04J 14/06 (2006.01)
CPC H04J 14/0221 (2013.01) [H04B 10/07955 (2013.01); H04B 10/506 (2013.01); H04B 10/614 (2013.01); H04J 14/021 (2013.01); H04J 14/06 (2013.01)] 22 Claims
OG exemplary drawing
 
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.