US 10,892,603 B2
Arrayed waveguide grating beam combiner
Robin Huang, Littleton, MA (US); Mike Cruz, Wakefield, MA (US); Jeff Shattuck, Methuen, MA (US); and Dan Dugmore, North Reading, MA (US)
Assigned to Forward Photonics, LLC, Woburn, MA (US)
Filed by Robin Huang, Littleton, MA (US); Mike Cruz, Wakefield, MA (US); Jeff Shattuck, Methuen, MA (US); and Dan Dugmore, North Reading, MA (US)
Filed on Feb. 28, 2019, as Appl. No. 16/289,114.
Claims priority of provisional application 62/636,808, filed on Feb. 28, 2018.
Prior Publication US 2019/0267776 A1, Aug. 29, 2019
Int. Cl. H01S 5/40 (2006.01); G02B 27/10 (2006.01); G02B 6/12 (2006.01); H01S 5/34 (2006.01); H01S 5/028 (2006.01); H01S 5/14 (2006.01)
CPC H01S 5/4012 (2013.01) [G02B 6/12009 (2013.01); G02B 27/1086 (2013.01); H01S 5/028 (2013.01); H01S 5/3402 (2013.01); H01S 5/4062 (2013.01); H01S 5/4087 (2013.01); H01S 5/141 (2013.01); H01S 5/4068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wavelength beam combination system, the wavelength beam combination system comprising:
a laser array, the laser array having an active region and a passive region; and
an arrayed waveguide grating having an input end, an output end, at least one slab waveguide between the input end and the output end, and an output waveguide between the at least one slab waveguide and the output end, wherein:
the input end has a first anti-reflection coating;
the input end is configured to receive light from the laser array;
the light is configured to travel from the input end, through the slab waveguide, and into the output waveguide;
the output waveguide is configured to separate the light into at least one output beam and at least one feedback beam;
the output end has a reflective coating configured to reflect the feedback beam from the output end through the arrayed waveguide grating, the feedback beam comprising light not matching a set output wavelength to the active region of the laser array;
the feedback beam is configured to seed a transmission inside the active region of the laser array after at least twice passing through the arrayed waveguide grating, the at least one slab waveguide, and the input end;
the transmission is configured to narrow a laser spectral output of a light beam emitted from the laser array; and
the arrayed waveguide grating is butt-coupled to the laser array.