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InP-based passive ring-resonator-coupled lasers

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3 Author(s)
Bian, Z. ; Jack Baskin Sch. of Eng., Univ. of California, Santa Cruz, CA, USA ; Liu, Bin ; Shakouri, Ali

The design of passive ring-coupled lasers based on InGaAsP waveguides is investigated using a beam propagation method. Mode coupling, propagation loss due to bending, and scattering loss from waveguide sidewall roughness are taken into account. By compromising threshold gain, linewidth and side-mode suppression ratio (SMSR), suitable waveguide width and coupling strength are determined for different ring sizes. Using a ring with radius ranging from 20 to 200 μm, it is possible to design passive ring-coupled lasers with threshold gain less than 60/cm and 80/cm for waveguide sidewall roughness 5 and 10 nm, respectively, SMSR larger than 50 dB, and linewidth in the range of ∼3-500 kHz.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:39 ,  Issue: 7 )