US 12,422,618 B2
Buried taper with reflecting surface
Monish Sharma, Artesia, CA (US); and Mehdi Asghari, La Canada Flintridge, CA (US)
Assigned to SiLC Technologies, Inc., Monrovia, CA (US)
Filed by SiLC Technologies, Inc., Monrovia, CA (US)
Filed on Oct. 13, 2022, as Appl. No. 17/965,749.
Prior Publication US 2024/0126011 A1, Apr. 18, 2024
Int. Cl. G02B 6/122 (2006.01); G01S 7/481 (2006.01); G02B 6/136 (2006.01)
CPC G02B 6/1228 (2013.01) [G01S 7/481 (2013.01); G02B 6/136 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical device, comprising:
a semiconductor chip having a photonic circuit that includes a waveguide having a first portion and a second portion,
a cross sectional area of the second portion of the waveguide being larger than a cross sectional area of the first portion of the waveguide,
the first portion of the waveguide being positioned over a device platform,
the waveguide including a taper that provides a transition between the first portion of the waveguide and the second portion of the waveguide, the taper being an inverted taper that extends below the first portion of the waveguide and into the device platform,
the second portion of the waveguide terminating at a facet; and
a recess extending into the chip, the recess having lateral sides,
a first one of the lateral sides serving as the facet and a second one of the lateral sides being positioned such that light signals that exit the waveguide through the facet travel across the recess to be received at the second lateral side,
the second lateral side being configured to reflect the received light signals toward a location that is above the chip or below the chip.