Title :
Tunable Homodyne Detection of an Incoming QPSK Data Signal Using Two Fixed Pump Lasers
Author :
Chitgarha, Mohammad Reza ; Mohajerin-Ariaei, Amirhossein ; Yinwen Cao ; Ziyadi, Morteza ; Khaleghi, Salman ; Almaiman, Ahmed ; Touch, Joseph D. ; Langrock, Carsten ; Fejer, Martin M. ; Willner, Alan E.
Author_Institution :
Ming Hsieh Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
Homodyne detection is of significant interest in optical communications because it detects both the amplitude and phase information of the incoming data channel. One of the challenges in implementing a homodyne receiver is to recover the phase and frequency of the incoming data and to lock these to the local oscillator. We proposed and demonstrated a tunable homodyne detection scheme using two continuous wave pumps to automatically lock a “local” pump laser to an incoming 20-to-40-Gbaud QPSK data signal. Open eyes are obtained for both in-phase and quadrature components of the signal after ~200-km transmission over single mode fiber (SMF-28) and dispersion compensation fiber without any carrier recovery. The BER performance of the proposed homodyne detection scheme is also performed with and without transmission.
Keywords :
error statistics; fibre lasers; homodyne detection; optical modulation; optical receivers; phase locked oscillators; quadrature phase shift keying; wireless channels; BER performance; QPSK data signal tunable homodyne detection; SMF-28; carrier recovery; continuous wave pump; data channel amplitude information detection; data channel phase information detection; dispersion compensation fiber; fixed pump laser; homodyne receiver; local oscillator; local pump laser lock; optical communication; quadrature phase shift keying; single mode fiber; Laser excitation; Optical fibers; Phase noise; Phase shift keying; Pump lasers; Homodyne detection; Nonlinear wave mixing; Optical coherent communication; Phase noise; Quadrature phase shift keying (QPSK); nonlinear wave mixing; optical coherent communication; phase noise; quadrature phase shift keying (QPSK);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2386340