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Proceedings Paper

All-optical NRZ to RZ format conversion using bistable semiconductor ring laser
Author(s): Bei Li; Gabor Mezosi; Muhammad Irfan Memon; Zhuoran Wang; Marc Sorel; Siyuan Yu
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Paper Abstract

In this paper, we propose and experimentally demonstrate an all-optical non-return-to-zero (NRZ) to return-to-zero (RZ) format conversion using semiconductor ring laser (SRL). A 155Mb/s NRZ optical data signal is injected into the counterclockwise (CCW) direction of the SRL and an optical logic clock signal is injected to the clockwise (CW) propagation direction. The power and wavelength on both sides are adjusted so that during the 'high' level of the clock, the SRL is held to the CW direction regardless of the logic value of the corresponding data bit. The SRL will only be switched to the CCW direction when the input data is 'high' and when the clock level is 'low'. Therefore the NRZ format signal is converted to RZ format signal, with a duty cycle decided by the duty cycle of the optical clock. Extinction ratio of > 10 dB has been achieved and the scheme can also be used for all-optical 3R. Although the speed of the signal is yet limited, higher speed can be achieved with faster SRL devices.

Paper Details

Date Published: 11 November 2008
PDF: 8 pages
Proc. SPIE 7136, Optical Transmission, Switching, and Subsystems VI, 71362X (11 November 2008); doi: 10.1117/12.803318
Show Author Affiliations
Bei Li, Univ. of Bristol (United Kingdom)
Gabor Mezosi, Univ. of Glasgow (United Kingdom)
Muhammad Irfan Memon, Univ. of Bristol (United Kingdom)
Zhuoran Wang, Univ. of Bristol (United Kingdom)
Marc Sorel, Univ. of Glasgow (United Kingdom)
Siyuan Yu, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 7136:
Optical Transmission, Switching, and Subsystems VI
Ken-ichi Kitayama; Pierpaolo C. Ghiggino; Kim Roberts; Yikai Su, Editor(s)

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