Probability of error for optical heterodyne DPSK system with quantum phase noise

In this paper, we present a method to improve the performance of a standard delay-and-multiply type optical heterodyne binary-DPSK receiver. This is achieved by using separate "weighting" bandpass filters to shape the phase noise cormpted direct and delayed signals before combining and decoding as for the standard receiver. The optimization of a filter parameter allows this "weighted" receiver to exhibit a lower phase noise sensitivity than the standard receiver. The most significant achievement of the weighted receiver is the ability to tradeoff excess signal power to obtain low bit error rates when large amounts of phase noise are present.

Section: Standard Binary Dpsk Receivermentioning

confidence: 99%

An improved optical heterodyne DPSK receiver to combat laser phase noise

Kaiser

Smith

Shafi³

1995

“…6 the experimental and theoretical phase noise penalties at various BER's in a mannar similar to that used in [6]. At linewidth of 1.2 MHz, E = 0.33 percent, the experimental system degradation is consistently higher than that of the theoretical estimate.…”

Section: Apparatus and Experimentsmentioning

confidence: 84%

“…These calculations predicted the degradations from optimal performance of a DPSK system, in the presence of laser phase noise. More detailed calculations [5], [6] followed taking into consideration the practical implementation of such a system by also considering post detection electronics. These detailed calculations assume an a priori knowledge of the probability density function of the carrier phase and calculate the subsequent effect by following it through the demodulation electronic components.…”

mentioning

confidence: 99%

Influence of laser phase on 400-Mbit/s coherent optical DPSK system

Kuo

Delavaux

Ackerman

et al. 1989

Abstruct-The influence of laser phase noise on a 400-Mbit/s optical DPSK system is experimentally investigated with linewidths ranging from 1.2 MHz to 8 MHz. This range corresponds to linewidth to bit rate ratios E of 0.33 to 2 percent. The system performance with these nonzero linewidths is evaluated against a negligible linewidth performance baseline.The sensitivity degradation at a bit error rate of increases from 1.8 to 7 dB as E is increased from 0.33 to 1 percent. When e is increased beyond 1 percent, bit error rate floors higher than develop. These findings agree well with the existing theories and allow the generalization of these results to other bit rates as well as establishing practical criteria for lasers to he used in DPSK systems.

“…Since is deterministic, the error probability formula (13) still applies. Thus using and (14) into (13) we get for coherent MPSK reception (16) Finally, when is Gaussian distributed, averaging (15) and (16) with respect to and using the fact that , we obtain, as done by Nicholson for DPSK [37], the desired expression of the BER, which in (1) and (3) is specialized to DQPSK/QPSK respectively by considering that the BER is approximately half the symbol error probability [38, footnote p. 1834].…”

Section: Appendix II Psk Ber With Gaussian Phase Noisementioning

confidence: 99%

Cross-Phase Modulation Induced by OOK Channels on Higher-Rate DQPSK and Coherent QPSK Channels

Bononi

Bertolini

Serena

et al. 2009

Abstract-In this paper we show that, in hybrid wavelength division multiplexed systems, the performance of high datatrate QPSK channels impaired by cross-phase modulation (XPM) induced by the lower rate OOK channels can be simply estimated by an extension of a well-known linear model for XPM, and novel analytical expressions of the sensitivity penalty are provided. From such a model we prove that the reported QPSK penalty decrease with QPSK baudrate increase should be attributed to the action of the phase estimation process rather than to the walkoff effect. The model also simply shows how coherent QPSK is more affected by XPM than incoherent DQPSK, and allows to infer that even more impact is expected when the baudrate is further reduced through polarization multiplexing.Index Terms-Cross phase modulation (XPM), differential quadrature phase shift keying (DQPSK), phase estimation, phase shift keying.