Ultra-Low Frequency-Noise Semiconductor Laser With Electronic Frequency Feedback Control and Homodyne Optical Phase Demodulation
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United States of America Patent
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Issued Date -
Jul 19, 2012
app pub date -
Dec 13, 2011
filing date -
Dec 13, 2010
priority date (Note) -
Abandoned
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Abstract
The present invention provides a semiconductor laser that operates with a frequency feedback control loop for frequency-noise reduction. The frequency-reduction architecture utilizes a homodyne optical phase demodulation approach. Such phase demodulation can be implemented with help of an unbalanced Michelson interferometer with fiber optics delay and symmetrical ‘n×n’ optical coupler. The entire demodulator is packaged in a small form-factor package which doesn't have any mechanical resonance in the sensing bandwidth, and has very low sensitivity to the external acoustic or vibration induced noise sources.
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