Abstract
We propose a novel and efficient multiplierless finite-impulse
response (FIR)-based filter architecture for chromatic dispersion
equalization (CDE) in coherent optical communication systems. After
quantizing the FIR coefficients, we take advantage of the high
multiplicity of their real and imaginary parts, employing the distributive
property of multiplication over addition to sharply reduce the number of
multiplication operations, obtaining the distributive FIR-CDE (D-FIR-CDE).
Furthermore, the implementation of multiplication operations with shifts
and additions allows us to obtain a multiplierless D-FIR-CDE (MD-FIR-CDE).
The proposed equalizers are experimentally validated in a 100G
polarization-multiplexed (PM)-QPSK long-haul optical link and compared
against benchmark FIR-CDE and frequency-domain (FD)-CDE implementations.
We demonstrate computational resources savings of over 99% in number of
multiplication operations and 40% in number of additions, relatively to
the FIR-CDE implementation. In addition, the D-FIR-CDE is also shown to
compare favorably relatively to the most widely used FD-CDE, achieving
significant gains both in terms of required chip area and latency: more
than 99% and 30% fewer multipliers and additions, respectively, and a
latency reduction of over 90%. We have also experimentally demonstrated
that the performance penalty imposed by the coefficient quantization tends
to decrease with increasing propagation length, rendering it as an
attractive solution for efficient and high-performance chromatic
dispersion compensation in long-haul optical fiber links.
© 2016 IEEE
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