Abstract
A description of a novel Y-branch photonic crystal laser diode operating at 1.55 m is presented. Optical gain calculations within an InGaAsP-InP multiple-quantum-well MQW gain medium predict a threshold current of 0.5 mA, which is lower than a typical ridge laser. The resonant structure of the beamsplitting laser is modeled using a scatter- ing matrix approach incorporating the effects of multiple internal reflec- tions on the cavity mode structure and mode spacing. Phase-matching conditions are derived, taking into account all the different resonant sub- structures. The results from the phase-matching analysis show an oper- ating mode that reduces threshold current beyond that of a geometrically similar conventional ridge laser. This Y-branch photonic crystal laser, when cascaded as a multichannel resonant structure, produces numer- ous optical intensity levels that can be used in an optical analog-to-digital converter ADC. © 2006 Society of Photo-Optical Instrumentation
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