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Dual-wavelength InGaAs-GaAs ridge waveguide distributed Bragg reflector lasers with tunable mode separation

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7 Author(s)
Roh, S.D. ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA ; Yeoh, T.S. ; Swint, R.B. ; Huber, A.E.
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The design and operation of integrated dual-wavelength sources are reported. These InGaAs-GaAs ridge waveguide (RW) distributed Bragg reflector (DBR) lasers consist of a common gain section and two, separate DBR sections. Multiple current injection is not necessary for these lasers to operate in dual-wavelength. Dual-wavelength operation is easily achieved by simply biasing the gain section. A relatively low coupling coefficient /spl kappa/ in the front grating reduces the added cavity loss for the back grating mode. Therefore, the back grating mode reaches threshold easily. Also, the addition of a spacing section lowers the current induced thermal interaction between the two uniform grating sections, significantly reducing the inadvertent wavelength drift. As a result, biasing the front DBR section results in tunable mode pair separations (/spl Delta//spl lambda/) as small as 0.3 nm and as large as 6.9 nm.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 10 )