Title :
Differential quadrature phase shift keying with close to homodyne performance based on multi-symbol phase estimation
Author :
van den Borne, Dirk ; Calabro, S. ; Jansen, S.L. ; Gottwald ; Khoe, G.D. ; de Waardt, H.
Author_Institution :
COBRA Inst., Eindhoven Univ. of Technol.
Abstract :
We discuss an improved detection scheme for differential phase shift keying (DPSK) and differential quadrature phase shift keying (DQPSK), based on multi-symbol phase estimation (MSPE) through electrical signal processing. Using a recursive electrical signal processing algorithm, close to homodyne performance is obtained without a local oscillator at the receiver. In the presence of only Gaussian noise the proposed scheme yields a 0.5 dB and 1.8 dB sensitivity improvement over self-homodyne detection, for DPSK and DQPSK respectively. It furthermore improves robustness against impairments due to the influence of a finite laser linewidth and nonlinear phase noise
Keywords :
Gaussian noise; differential phase shift keying; homodyne detection; optical communication; optical modulation; optical signal detection; quadrature phase shift keying; DQPSK; Gaussian noise; differential quadrature phase shift keying; electrical signal processing; electrical signal processing algorithm; finite laser linewidth; homodyne performance; multisymbol phase estimation; nonlinear phase noise; self-homodyne detection;
Conference_Titel :
Optical Fibre Communications and Electronic Signal Processing, 2005. The IEE Seminar on (Ref. No. 2005-11310)
Conference_Location :
London
Print_ISBN :
0-86341-598-9
