Title :
PLL-free synchronous QPSK polarization multiplex/diversity receiver concept with digital I&Q baseband processing
Author_Institution :
Univ. Paderborn, Germany
fDate :
4/1/2005 12:00:00 AM
Abstract :
This synchronous quadrature-phase-shift keying (QPSK) receiver concept allows us to process signals in parallel after electronic demultiplexing. An automatic electronic polarization control with a control time constant in the low microsecond range is provided. It is followed by a phase-locked loop free carrier recovery. An intermediate frequency linewidth tolerance of up to 10-3 times the QPSK symbol rate is expected. Commercially available distributed feedback lasers shall, therefore, suffice.
Keywords :
demultiplexing; multiplexing; optical fibre communication; optical modulation; optical phase locked loops; optical receivers; quadrature phase shift keying; synchronisation; I & Q baseband processing; control time constant; diversity receiver; electronic demultiplexing; frequency linewidth tolerance; in-phase and quadrature; parallel signal processing; phase-locked loop free carrier recovery; polarization multiplex; quadrature-phase-shift keying; synchronous QPSK; Automatic control; Baseband; Demultiplexing; Distributed feedback devices; Frequency; Laser feedback; Phase locked loops; Polarization; Quadrature phase shift keying; Signal processing; Homodyne detection; optical fiber communication; phase-shift keying; quadrature-phase-shift keying (QPSK); synchronous detection;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.842795
