Equalization of Multimode Optical Fiber Systems

Abstract

Decision feedback equalization (dfe) may provide a simple way to dramatically increase the bit rate on multimode optical systems. Computer simulations of digital multimode systems with tapped delay‐line linear equalization and/or dfe are described. Results indicate that with relatively simple hardware it may be possible to increase by many times the usable bit rate on dispersion‐limited optical channels, with a power penalty less than that for multilevel transmission and without the latter's complexity. For example, one could double the bit rate of a two‐level system by paying an equalization power penalty of about 3 dB with dfe, whereas doubling the bit rate by going to four levels requires a penalty of 4.8 dB.

Equalization and FEC techniques for optical transceivers

“…However, implementation of equalization at rates exceeding 10 Gb/s for optical applications is not so straightforward. Previous work [8] proposed the general concept of electrical compensation of DMD in MMFs, and in [9]- [11] board-level implementations of 10-Gb/s electrical fiber equalization have been reported. The main challenge in the implementation of high-speed digital equalization resides in the design of a 10 GS/s analog-to-digital (A/D) converter.…”

Architecture and Experimental Evaluation of a 10Gb/s MLSD-Based Transceiver for Multimode Optical Fibers

“…However, most of the literature on EDC for multimode fibers (MMF) is based on the decision-feedback equalizer [5], [6]. The MMF channel differs significantly from the SMF channel, therefore the application of MLSD to MMF requires new work.…”

Performance of fractional tap-spacing equalizers for long-haul high-capacity digital fibre-optic communication systems

“…The number of primary pairs generated at any time interval can be considered statistically independent of pairs generated at any other disjoint interval. The generation of primary carriers can therefore be described by Poisson statistics with intensity A(t) [2].…”

“…In general, the sampling instant obtained can be different from the one considered in the equalizer calculation. In this case an increase in the received optical power is needed and, suddenly, the performance of the system drops quickly [2].…”