Collective compensation of an inter-chip intensity discrepancy for a 4ch QPSK FE-SOCDM system with Si-based ODFT and electrical DFT | Zendy

Takahiro Kodama | Zendy; Tomoki Nukanobu | Zendy; T. Miyazaki | Zendy; Masanori Hanawa | Zendy

Open Access

Collective compensation of an inter-chip intensity discrepancy for a 4ch QPSK FE-SOCDM system with Si-based ODFT and electrical DFT

Author(s) -

Takahiro Kodama,

Tomoki Nukanobu,

T. Miyazaki,

Masanori Hanawa

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.025909

Subject(s) - optics , phase shift keying , multiplexing , chip , intensity modulation , physics , wavelength division multiplexing , keying , electronic engineering , phase modulation , computer science , phase noise , bit error rate , telecommunications , decoding methods , engineering , wavelength

An intensity-sloped optical code with an optical chip-pulse stream generated by Si-based ODFT suffers from crosstalk and signal-to-noise (SNR) degradation. To mitigate these problems related to code-orthogonality reduction, we propose a simple intensity-discrepancy-compensation scheme that involves adjusting the chip-level intensity in the digital-domain. We numerically show a 0.1 dB SNR improvement for 40 Gb/s quadrature phase-shift keying (QPSK) Fourier-encoded synchronized optical code division multiplexing (FE-SOCDM) signal when multiplexing 1 dB/chip intensity-sloped optical codes. A proof-of-principle experiment achieves a 0.3 dB received power improvement using intensity-discrepancy compensation for two optical code multiplexing signals with 1.5 dB/chip.

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