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Characteristics of single-longitudinal-mode selection in short-coupled-cavity (SCC) injection lasers

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3 Author(s)
Lin, Chinlon ; AT&T Bell Laboratories, Holmdel Laboratory, Holmdel, NJ, USA ; Burrus, C.A., Jr. ; Coldren, L.A.

Effective single-longitudinal-mode selection can be achieved in short-coupled-cavity (SCC) injection lasers consisting of a cleaved short-cavity laser (length L , refractive index n ) with a short external resonator (spacing d). The mode-selectivity is due to the combined advantages of large gain-rolloff for the adjacent modes in the short ( cavity, and resonator-loss-modulation in the coupled cavity. This I paper discusses the theoretical considerations and experimental studies for the SCC lasers. The results show that for good single-longitudinal-mode operation, the resonator-loss modulation period factor m , given by the effective optical length ratio nL/d , should be between approximately three and eight, with typical short-cavity laser length L in the 40-100-\mu m range and external resonator spacing d also in the 40-120- \mu m range, depending on the specific L .

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Lightwave Technology, Journal of  (Volume:2 ,  Issue: 4 )