Abstract
We present an extensive study of equalization enhanced phase noise (EEPN) in coherent optical system for all practical electronic dispersion compensation configurations. It is shown that there are only eight practicable all-electronic impairment mitigation configurations. The non-linear and time variant analysis reveals that the existence and the cause of EEPN depend on the digital signal processing (DSP) schemes. There are three schemes that in principle do not cause EEPN. Analysis further reveals the statistical equivalence of the remaining five system configurations resulting in EEPN. In three of them, EEPN is due to phase noise of the transmitting laser, while in the remaining two, EEPN is caused by the local oscillator. We provide a simple look-up table for the system designer to make an informative decision regarding practicable configuration choice and design.
Highlights
Coherent detection in optical communication was extensively studied in the 80’s and 90’s because of its ability to achieve high receiver sensitivity
The analysis reveals that the existence and origin of enhanced phase noise (EEPN) depends on the digital signal processing (DSP) scheme for electronic impairment mitigation
There are three configurations that do not result in EEPN in spite of all-electronic impairment mitigation
Summary
Coherent detection in optical communication was extensively studied in the 80’s and 90’s because of its ability to achieve high receiver sensitivity. Various studies have been performed with both simulations and system experiments to evaluate these impairments for different modulations on receiver carrier recovery and adaptive equalizers [17,18,19] This noise enhancement is shown to be in both phase and amplitude dimensions and will cause time jitter [20,21,22], which is not observed in systems with ideal dispersion compensation in the optical domain. We recently revisited this phenomenon and show in [23] with a frequency domain analysis that the EEPN-induced transmission penalty is mainly due to low frequency noise of the local oscillator (LO). Based on the findings in [23,24,25], a realistic implementation of the mitigation technique was proposed in [26]
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