US 12,463,396 B2
Raman optical amplifier with fabry-perot pump laser
Youichi Akasaka, Plano, TX (US)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Sep. 30, 2021, as Appl. No. 17/491,476.
Prior Publication US 2023/0102535 A1, Mar. 30, 2023
Int. Cl. H01S 3/094 (2006.01); H01S 3/067 (2006.01); H01S 3/0941 (2006.01); H01S 3/10 (2006.01); H01S 3/30 (2006.01)
CPC H01S 3/094046 (2013.01) [H01S 3/06754 (2013.01); H01S 3/09415 (2013.01); H01S 3/1003 (2013.01); H01S 3/302 (2013.01); H01S 2301/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical system comprising:
a temperature and current dependent pump laser configured to:
receive a fixed input current such that the fixed input current is maintained to have a same value during operation of the pump laser, the fixed input current being based on a maximum current of the pump laser;
receive a first tuning temperature while receiving the fixed input current, the first tuning temperature being based on a target band of a pumping beam; and
generate a light beam having a first frequency band that includes a first center frequency and a first bandwidth in which the first frequency band is dictated by the first tuning temperature and the fixed input current;
a temperature dependent optical reflector configured to:
receive the light beam generated by the pump laser;
receive a second tuning temperature that is based on the target band of the pumping beam; and
produce a reflected light beam by reflecting light of the light beam that is within a second frequency band that corresponds to the target band in which the second frequency band reflected by the optical reflector is dictated by the second tuning temperature; and
an output optical medium configured to receive the reflected light beam and emit, as the pumping beam, the reflected light beam in a transmission optical medium configured to carry an optical signal.