Abstract
Improvement in signal-to-noise ratio (SNR) is described for 830 nm AlGaAs double heterostructure lasers longitudinally coupled to a short complex cavity formed by a laser facet and an external mirror separated from the facet by a few micrometers. The SNR degraded by external cavity length (spacing) variation is improved by reducing internal laser facet reflectivity using an anti-reflection coating. A variation ratio, newly defined to evaluate light output variation due to spacing, reaches 1.6 at a reflectivity of 6.8×10-5. The SNR degraded by laser intensity noise is improved to 56 dB by biasing the drive current at an optimum corresponding to the noise valley which appears for lower laser facet reflectivity. The SNR degraded by temperature variation is improved by linear current control, maintaining a maximum value of it from 10 to 45°C.
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