Linewidth properties of active-passive coupled monolithic InGaAs semiconductor ring lasers

Choi, Muhan; Tanaka, Tomoko; Sunada, Satoshi; Harayama, Takahisa
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p231110
Academic Journal
We report linewidth properties of active-passive coupled monolithic InGaAs semiconductor ring lasers with various length of passive waveguide. It is experimentally confirmed that the linewidth of the lasers is proportional to the square of the ratio of the length of active part of the cavity over the total length of the cavity. The lasers are applicable for communication and sensing devices, which need the narrow linewidth.


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