| CPC H01S 5/142 (2013.01) [H01S 5/026 (2013.01); H01S 5/1028 (2013.01); H01S 5/1032 (2013.01); H01S 5/50 (2013.01); H01S 5/021 (2013.01); H01S 5/02325 (2021.01); H01S 5/0261 (2013.01); H01S 5/0687 (2013.01)] | 17 Claims |
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1. A wavelength tunable laser, wherein the wavelength tunable laser comprises a reflective semiconductor optical amplifier, three couplers, and at least two microring resonators, and wherein:
the three couplers comprise a first coupler, a second coupler, and a third coupler, wherein the first coupler comprises a first port, a second port, and a third port, wherein the second coupler comprises a first port, a second port, a third port, and a fourth port, and wherein the third coupler comprises three ports;
the reflective semiconductor optical amplifier is connected to the first port of the first coupler, wherein one or more of the at least two microring resonators are arranged between the second port of the first coupler and the first port of the second coupler, wherein the others of the at least two microring resonators are arranged between the third port of the first coupler and the second port of the second coupler, and wherein the third port and the fourth port of the second coupler are connected to two ports of the third coupler; and
wherein one port of each of the at least two microring resonators is connected to one of a plurality of photodetectors, and the plurality of photodetectors are configured to obtain optical power information of each of the at least two microring resonators, to implement dynamic alignment between a target wavelength output by the wavelength tunable laser and a resonance wavelength of the at least two microring resonators; and
wherein the wavelength tunable laser further comprises a first refractive index tuning unit, and wherein the first refractive index tuning unit is located between the third port of the second coupler and a port of the third coupler that is connected to the third port of the second coupler, or the first refractive index tuning unit is located between the fourth port of the second coupler and a port of the third coupler that is connected to the fourth port of the second coupler.
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