Abstract
We propose maximum-likelihood sequence estimator (MLSE) equalizers based
on either Viterbi algorithm or template matching temple matching (TM) for
the equalization of impairments imposed on the minimum shift keying (MSK)
modulation formats in long haul transmission without optical dispersion compensation.
The TM-MLSE equalizer is proposed as a simplified alternative for the Viterbi-MLSE
equalizer. It is verified that the Viterbi-MLSE equalizer can operate optimally when noise approaches a Gaussian distribution.
Simulation results of the performances of the two MLSE equalizers for optical
frequency discrimination receiver-based optical MSK systems are described.
The transmission performance is evaluated in terms of: 1) the chromatic dispersion
(CD) tolerance for both Viterbi-MLSE and TM-MLSE equalizers; 2) transmission
distance limits of Viterbi-MLSE equalizers with various number of states;
3)the robustness to fiber polarization mode dispersion (PMD) of Viterbi-MLSE
equalizers; and 4) performance improvements for Viterbi-MLSE equalizers when
utilizing sampling schemes with two and four samples per bit over the conventional
single sample per bit. With a small number of states (64 states), the non-compensating
optical link can equivalently reach up to approximately 928 km SSMF for 10
Gb/s transmission or 58 km SSMF for 40 Gb/s. The performance of 16-state Viterbi-MLSE
equalizers for optical frequency discrimination receiver (OFDR)-based optical
MSK transmission systems for PMD mitigation is also numerically investigated.
The performance of Viterbi-MLSE equalizers can be further improved by using
the sampling schemes with multiple samples per bit compared to the conventional
single sample bit. The equalizer also offers high robustness to fiber PMD impairment.
© 2008 IEEE
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