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Zero-Offset Frequen...
Zero-Offset Frequency Locking of Lasers At Low Optical Powers With an Optical Phase Locked Loop
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- Larsson, Rasmus, 1994 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Vijayan, Kovendhan, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Andrekson, Peter, 1960 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 42:3, s. 1183-1190
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Abstract
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- Frequency locking of lasers is fundamental to a vast number of applications within the field of optics. Usually, when locking a laser to an optical reference wave, it is imperative that locking can be maintained in spite of low reference powers. Previous solutions to frequency locking involve injection locking and/or optical phase locked loops. While previous works have shown locking to weak waves, we extend the lowest demonstrated optical power locked to by approximately 20 dB, realizing locking down to -90 dBm, using a novel digital dither optical phase-locked loop. Measurements of the locked laser phase error verify the performance. The loop design circumvents the presence of a dither on the locked laser light, hence avoiding dither penalties, and low-power locking is realized via coherent detection gain without any optical amplifiers. Low phase noise standard deviations of less than 20°at -80 dBm optical power and Allan deviation of $3\cdot 10^{-16}$ at 1 s averaging time indicate great potential for a variety of applications within optical sensing, communications, and metrology.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Keyword
- Optical receivers
- Optical phase-locked loop
- sensing
- Optical fiber sensors
- Optical amplifiers
- Optical pumping
- Optical noise
- Communications
- phase noise
- Low power
- metrology
- Optical fibers
- Adaptive optics
- laser frequency locking
Publication and Content Type
- art (subject category)
- ref (subject category)
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