US 12,442,992 B2
Wavelength division multiplexer
Long Chen, Marlboro, NJ (US); Christopher Doerr, Middletown, NJ (US); and Li Chen, Marlboro, NJ (US)
Filed by ACACIA TECHNOLOGY, INC., San Jose, CA (US)
Filed on Jun. 6, 2022, as Appl. No. 17/833,299.
Application 17/833,299 is a division of application No. 16/441,775, filed on Jun. 14, 2019, granted, now 11,353,666.
Application 16/441,775 is a continuation of application No. PCT/US2017/067889, filed on Dec. 21, 2017.
Claims priority of provisional application 62/437,628, filed on Dec. 21, 2016.
Prior Publication US 2022/0308296 A1, Sep. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 6/293 (2006.01); G02B 6/12 (2006.01); G02B 6/42 (2006.01)
CPC G02B 6/4215 (2013.01) [G02B 6/12007 (2013.01); G02B 6/29332 (2013.01); G02B 6/2938 (2013.01); G02B 2006/12097 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An integrated wavelength division multiplexer, comprising:
a first waveguide core extending along a first propagation axis only and configured to guide light of a first wavelength and light of a second wavelength; and
a second waveguide core extending along a second propagation axis only and configured to guide the light of the second wavelength only, wherein the second propagation axis is oriented at a non-zero angle relative to the first propagation axis, and wherein the second waveguide core is embedded within the first waveguide core at an end of the first waveguide core,
wherein a cross-section of the first waveguide core continuously shrinks along an entire length of the first propagation axis, wherein a cross-section of the second waveguide core continuously expands along an entire length of the second propagation axis, and wherein the first waveguide core and second waveguide core are configured relative to each other to adiabatically couple the light of the second wavelength between the first waveguide core and the second waveguide core.