US 11,735,574 B2
Method and system for selectively illuminated integrated photodetectors with configured launching and adaptive junction profile for bandwidth improvement
Kam-Yan Hon, Oceanside, CA (US); Subal Sahni, La Jolla, CA (US); Gianlorenzo Masini, Carlsbad, CA (US); and Attila Mekis, Carlsbad, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by LUXTERA LLC, Wilmington, DE (US)
Filed on Jun. 16, 2021, as Appl. No. 17/304,225.
Application 17/304,225 is a continuation of application No. 16/001,135, filed on Jun. 6, 2018, granted, now 11,049,851, issued on Jun. 29, 2021.
Claims priority of provisional application 62/516,949, filed on Jun. 8, 2017.
Prior Publication US 2021/0313306 A1, Oct. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01L 25/16 (2023.01); F21V 8/00 (2006.01); G02B 6/12 (2006.01)
CPC H01L 25/167 (2013.01) [G02B 6/0006 (2013.01); G02B 6/12004 (2013.01); G02B 6/12007 (2013.01); G02B 2006/12111 (2013.01); G02B 2006/12126 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
an input waveguide configured to propagate an optical signal along a first dimension; and
a photodiode comprising:
an absorbing region configured to receive the optical signal; and
a semiconductor layer arranged beneath the absorbing region and extending to opposing first and second sides of the absorbing region relative to a second dimension different than the first dimension, wherein the semiconductor layer comprises one or more p-doped regions and one or more n-doped regions arranged such that, along an extent of the semiconductor layer in the first dimension, a location of a P-N junction of the semiconductor layer within the second dimension varies according to a beating pattern of the optical signal.