US 12,476,713 B2
Fabrication tolerant wavelength demultiplexer receiver
Long Chen, Marlboro, NJ (US); Qianfan Xu, San Jose, CA (US); and Jonathan Edgar Roth, San Mateo, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on May 30, 2023, as Appl. No. 18/325,933.
Prior Publication US 2024/0405883 A1, Dec. 5, 2024
Int. Cl. H04B 10/00 (2013.01); H04B 10/294 (2013.01); H04B 10/50 (2013.01); H04B 10/61 (2013.01); H04J 14/00 (2006.01)
CPC H04B 10/614 (2013.01) [H04B 10/294 (2013.01); H04B 10/506 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A receiver comprising:
at least two input ports, wherein an optical signal containing n wavelengths is coupleable to only one of these input ports, wherein n>1;
a first demultiplexer coupled to a first input port of the at least two input ports to separate n wavelengths in the first input port onto n first multiplexer output ports;
a second demultiplexer coupled to a second input port of the at least two input ports to separate the n wavelengths in the second input port onto n second multiplexer output ports; and
a waveguide crossing matrix comprising an input side and an output side, the waveguide crossing matrix coupled to the n first multiplexer output ports and the n second multiplexer output ports on the input side and coupled to n shared photodetectors on the output side, one for each wavelength channel, wherein each one of the n shared photodetectors is coupled to one of the n first multiplexer output ports for one wavelength channel and is coupled to one of the n second multiplexer output ports for the one wavelength channel.