Phasor monitoring of DxPSK signals using software-based synchronization technique

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We develop a novel phasor monitor to obtain the constellation diagram from asynchronously sampled data measured by using the delay-detection technique. This phasor monitor consists of three parts; a phase-adjustment-free delay-interferometer, an optical front-end made of three photodetectors, and analog-to-digital (A/D) convertors, and a digital signal processor. We operate the A/D convertor at the sampling rate much slower than the symbol rate and acquire the data asynchronously. However, despite the use of such a slow and asynchronous sampling rate, we obtain the clear eye and constellation diagrams by utilizing the software-based synchronization technique based on a novel phased-reference detection algorithm. Thus, the proposed phasor monitor can be implemented without using high-speed A/D convertors and buffer memories, which have been the major obstacles for the cost-effective realization of the phasor monitor. For a demonstration, we realize the proposed phasor monitor by using an A/D converter operating at 9.77 MS/s and used it for the constellation monitoring and bit-error-rate (BER) estimation of 10.7-Gsymbol/s differential quadrature phase-shift keying (DQPSK) and differential 8-ary phase-shift keying (D8PSK) signals. (C) 2010 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2010-10
Language
English
Article Type
Article
Keywords

CARRIER PHASE; COHERENT DETECTION; MODULATION

Citation

OPTICS EXPRESS, v.18, no.21, pp.21511 - 21518

ISSN
1094-4087
DOI
10.1364/OE.18.021511
URI
http://hdl.handle.net/10203/94045
Appears in Collection
EE-Journal Papers(저널논문)
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