Error Detection and Correction in a Photo-Digital Storage System

1968 ◽  
Vol 12 (6) ◽  
pp. 422-430 ◽  
Author(s):  
I. B. Oldham ◽  
R. T. Chien ◽  
D. T. Tang
Keyword(s):  
Error Detection ◽  
Storage System ◽  
Digital Storage ◽  
Error Detection And Correction

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

2018 ◽  
Vol 8 (9) ◽  
pp. 1440 ◽  
Author(s):  
Yohei Aikawa
Keyword(s):  
Error Detection ◽  
Communication Systems ◽  
Delay Line ◽  
Hamming Distance ◽  
Code Word ◽  
Modulation Format ◽  
Comparison Operation ◽  
Error Detection And Correction ◽  
All Optical ◽  
Shift Keying

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.

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