Zero-Offset Frequency Locking of Lasers At Low Optical Powers With an Optical Phase Locked Loop
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| Titel: | Zero-Offset Frequency Locking of Lasers At Low Optical Powers With an Optical Phase Locked Loop |
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| Autoren: | Larsson, Rasmus, 1994, Vijayan, Kovendhan, 1991, Andrekson, Peter, 1960 |
| Quelle: | Journal of Lightwave Technology. 42(3):1183-1190 |
| Schlagwörter: | 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 |
| Beschreibung: | 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. |
| Dateibeschreibung: | electronic |
| Zugangs-URL: | https://research.chalmers.se/publication/538485 https://research.chalmers.se/publication/538485/file/538485_Fulltext.pdf |
| Datenbank: | SwePub |
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Nájsť tento článok vo Web of Science | Abstract: | 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. |
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| ISSN: | 07338724 15582213 |
| DOI: | 10.1109/JLT.2023.3330707 |