Title :
Filtering penalty reduction by adjusting passband shape in optical filter for 127 Gbit/s DP-QPSK signal transmission
Author :
Sakamaki, Y. ; Kawai, Takaaki ; Komukai, Tetsuro ; Sohma, S. ; Iwaki, A. ; Inui, Tomoki ; Fukutoku, Mitsunori ; Kataoka, Takeshi
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Yokosuka, Japan
Abstract :
It is experimentally demonstrated that a filtering penalty could be substantially reduced by adjusting the passband shape, or introducing a loss ripple, in an optical filter for 127 Gbit/s DP-QPSK signal transmission. Experimental results showed that the Q-factor penalty for 20 cascaded filters with a loss ripple of 0.3 dB was 1.4 dB lower than that for conventional filters without a loss ripple at a received OSNR of 16 dB.
Keywords :
Q-factor; filtering theory; optical filters; optical modulation; quadrature phase shift keying; wavelength division multiplexing; DP-QPSK signal transmission; Q-factor; bit rate 127 Gbit/s; cascaded filters; dual-polarisation quadrature phase-shift keying modulation; filtering penalty reduction; loss 0.3 dB; loss ripple; optical filter; passband shape; wavelength division multiplexing optical transmission system;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.0245
