Feed-forward true carrier extraction of high baud rate phase shift keyed signals using photonic modulation stripping and low-bandwidth electronics
Feed-forward true carrier extraction of high baud rate phase shift keyed signals using photonic modulation stripping and low-bandwidth electronics
Retrieving the full information carried by phase shift keyed (PSK) data streams requires a reference local oscillator (LO). If the receiver utilizes digital signal processing (DSP), a free-running LO can be used, although several benefits can be derived from generating an optical LO that is locked in frequency and phase to the original signal carrier (which is unfortunately suppressed in the PSK data modulation process). Here, we present a new concept of carrier recovery. Using nonlinear optics, we strip the data modulation and derive an error signal proportional to the phase/frequency difference between a free running intradyne LO and the data-stripped signal. After extracting this frequency difference (using slow electronics), we frequency shift the free running LO by this amount, effectively obtaining a homodyne LO. The carrier is recovered to a precision of better than ±0.5 Hz and the method is tested by performing homodyne detection of a 20 Gbaud binary PSK signal.
26594-26599
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Kakande, Joseph
70e0019d-0e99-4412-8104-97c84128ae27
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
19 December 2011
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Kakande, Joseph
70e0019d-0e99-4412-8104-97c84128ae27
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan, Kakande, Joseph and Richardson, David J.
(2011)
Feed-forward true carrier extraction of high baud rate phase shift keyed signals using photonic modulation stripping and low-bandwidth electronics.
Optics Express, 19 (27), .
(doi:10.1364/OE.19.026594).
Abstract
Retrieving the full information carried by phase shift keyed (PSK) data streams requires a reference local oscillator (LO). If the receiver utilizes digital signal processing (DSP), a free-running LO can be used, although several benefits can be derived from generating an optical LO that is locked in frequency and phase to the original signal carrier (which is unfortunately suppressed in the PSK data modulation process). Here, we present a new concept of carrier recovery. Using nonlinear optics, we strip the data modulation and derive an error signal proportional to the phase/frequency difference between a free running intradyne LO and the data-stripped signal. After extracting this frequency difference (using slow electronics), we frequency shift the free running LO by this amount, effectively obtaining a homodyne LO. The carrier is recovered to a precision of better than ±0.5 Hz and the method is tested by performing homodyne detection of a 20 Gbaud binary PSK signal.
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oe-19-27-26594
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Published date: 19 December 2011
Organisations:
Optoelectronics Research Centre
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Local EPrints ID: 209065
URI: http://eprints.soton.ac.uk/id/eprint/209065
ISSN: 1094-4087
PURE UUID: bd35a538-b58b-4645-a796-0c6a2d8d82ec
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Date deposited: 25 Jan 2012 14:42
Last modified: 15 Mar 2024 03:32
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Author:
Joseph Kakande
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