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Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector

Steed, RJ; Pozzi, F; Fice, MJ; Renaud, CC; Rogers, DC; Lealman, IF; Moodie, DG; ... Seeds, AJ; + view all (2011) Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector. Optics Express , 19 (21) 20048 - 20053. 10.1364/OE.19.020048. Green open access

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Abstract

We present results for an heterodyne optical phase-lock loop (OPLL), monolithically integrated on InP with external phase detector and loop filter, which phase locks the integrated laser to an external source, for offset frequencies tuneable between 0.6 GHz and 6.1 GHz. The integrated semiconductor laser emits at 1553 nm with 1.1 MHz linewidth, while the external laser has a linewidth less than 150 kHz. To achieve high quality phase locking with lasers of these linewidths, the loop delay has been made less than 1.8 ns. Monolithic integration reduces the optical path delay between the laser and photodiode to less than 20 ps. The electronic part of the OPLL was implemented using a custom-designed feedback circuit with a propagation delay of similar to 1 ns and an open-loop bandwidth greater than 1 GHz. The heterodyne signal between the locked slave laser and master laser has phase noise below. 90 dBc/Hz for frequency offsets greater than 20 kHz and a phase error variance in 10 GHz bandwidth of 0.04 rad(2). (C) 2011 Optical Society of America

Type: Article
Title: Monolithically integrated heterodyne optical phase-lock loop with RF XOR phase detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.19.020048
Publisher version: http://dx.doi.org/10.1364/OE.19.020048
Language: English
Additional information: © 2011 Optical Society of America
Keywords: LASER-DIODES, TRANSMISSION, GENERATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1331757
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