Title :
Nyquist-WDM With Low-Complexity Joint Matched Filtering and Adaptive Equalization
Author :
Chen Zhu ; Corcoran, B. ; Tran, A.V. ; Lowery, Arthur J.
Author_Institution :
Dept. of Electr. & Comput. Syst. Eng., Monash Univ., Clayton, VIC, Australia
Abstract :
In this letter, we investigate the application of jointly processing the matched filtering and blind adaptive equalization functions in a receiver for a Nyquist wavelength division multiplexing (Nyquist-WDM) system employing a root-raised-cosine (RRC) pulse shaping filter. We show that blind equalization is able to also provide the matched filtering function, if the number of filter taps is increased. In addition, if implemented in the frequency domain, this form of blind equalization is more computationally efficient than when a separate RRC is used. It is also verified that this method is not sensitive to frequency offset. We demonstrate a 16-channel 19-GBd Nyquist-WDM system with QPSK and 16-quadrature-amplitude-modulation formats, and find the frequency domain blind equalizer can replace the RRC filter without adding a performance penalty.
Keywords :
optical filters; optical modulation; optical pulse shaping; optical receivers; quadrature amplitude modulation; quadrature phase shift keying; wavelength division multiplexing; Nyquist wavelength division multiplexing system; Nyquist-WDM system; QPSK; RRC pulse shaping filter; blind adaptive equalization functions; low-complexity joint matched filtering function; optical receiver; root-raised-cosine; sixteen-quadrature-amplitude-modulation formats; Adaptive equalizers; Blind equalizers; Frequency-domain analysis; Matched filters; Optical filters; Phase shift keying; 16-QAM; Coherent optical system; QPSK; blind adaptive equalization; matched filtering;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2355203
