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A 1490 nm InGaAsP single-mode laser diode, with high endurance against external optical feedback, was realized utilizing an optimized partially corrugated grating and a window-mirror-structure. The gratingpsilas length and the coupling coefficient were designed to enable moderate output power, low feedback sensitivity and a SMSR of 40 dB simultaneously. The relative intensity noise (RIN) was maintained less than -120 dB/Hz under strong external optical feedback as high as -10 dB.
Date of Conference: 14-18 Sept. 2008