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Open AccessArticle

Optical Comparison Operation for 8-Bit QPSK-Modulated Signal by Using Serially-Cascaded Delay Line Interferometer

Department of Information and Communication Systems Engineering, National Institute of Technology, Okinawa College, 905 Henoko, Nago, Okinawa 905-2192, Japan
Appl. Sci. 2018, 8(9), 1440; https://doi.org/10.3390/app8091440
Received: 30 July 2018 / Revised: 16 August 2018 / Accepted: 21 August 2018 / Published: 23 August 2018
(This article belongs to the Section Optics and Lasers)
An all-optical comparator is desirable to realize large-capacity, fully-transparent, and energy-efficient communication systems, as it is considered to be a fundamental component to perform most of the operations, including packet switching, label recognition, error detection and correction, and so on. However, most of the previous studies have been confined to the on–off keying (OOK) modulation format, not phase-shift keying (PSK) modulation. In this paper, the author provides a novel optical comparator designed for quadrature PSK (QPSK)-modulated signal, which comprises a code word with 8-bit length, using a serially-cascaded delay line interferometer. The proposed comparator yields constellations having the information of a Hamming distance based on the designed code, when several patterns of QPSK signal are injected into the comparator. The paper experimentally demonstrates the feasibility of the optical comparison operation for 8-bit QPSK-modulated return-to-zero (RZ) signal at 10 Gbaud. View Full-Text
Keywords: optical communication; optical signal processing; comparison operation optical communication; optical signal processing; comparison operation
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Aikawa, Y. Optical Comparison Operation for 8-Bit QPSK-Modulated Signal by Using Serially-Cascaded Delay Line Interferometer. Appl. Sci. 2018, 8, 1440.

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