Comparison between first-order and second-order optical phase-lock loops

A comparison between the performance of modified first-order and second-order optical phase-lock loops (OPLL's) is made, revealing that the modified first-order loop offers better performance when long loop delay time is present and a wide bandwidth loop filter is used. The introduction of a 10...

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Bibliographic Details
Published in:IEEE microwave and guided wave letters 1994-01, Vol.4 (1), p.6-8
Main Authors: Ramos, R.T., Seeds, A.J.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Delay effects
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fiber lasers
Masers
Microwave antenna arrays
Microwave generation
Miscellaneous
Optical and optoelectronic circuits
Optical arrays
Optical filters
Optical mixing
Optical sensors
Semiconductor laser arrays
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Summary:A comparison between the performance of modified first-order and second-order optical phase-lock loops (OPLL's) is made, revealing that the modified first-order loop offers better performance when long loop delay time is present and a wide bandwidth loop filter is used. The introduction of a 10 dB gain margin from the critical gain can be used to keep the damping close to that expected when the delay time is negligible. If OPLL design is optimized for this gain margin and 5 MHz linewidth lasers are used, the increase in the phase-error variance with delay time is 54 rad 2 /μs for a modified first-order and 80 rad 2 /μs for a second-order loop, confirming that modified first-order loops are less sensitive to loop delay.
ISSN:1051-8207
1558-2329
DOI:10.1109/75.267677