Return-to-zero (RZ) modulation of multifrequency lasers (MFLs) for application to optical CDMA

Antonio J. Mendez; John Michael Morookian

doi:10.1117/12.469637

7 June 2002 Return-to-zero (RZ) modulation of multifrequency lasers (MFLs) for application to optical CDMA

Antonio J. Mendez, John Michael Morookian

Proceedings Volume 4653, WDM and Photonic Switching Devices for Network Applications III; (2002) https://doi.org/10.1117/12.469637
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

Abstract

Optical CDMA (O-CDMA) based on matrix codes (e.g., Wavelength/Time, or W/T, matrices) can have a higher capacity and spectral efficiency (bit/s/Hz) than WDM. We have ben exploring the implementation of W/T matrices with WDM components. The wavelength part of the W/T matrices is generated by a WDM laser array consisting of multiple independent laser cavities (each at a distinct ITU frequency) coupled through a semiconductor optical amplifier (SOA). These integrated laser arrays are known as MFLs. The time-like part of the W/T matrix codes is produced by Bragg grating arrays. The W/T matrix implementation requires that the wavelengths be synchronously on-off-keyed (OOF) with a return-to-zero (RZ) modulation of less than 25% duty cycle, and that the synchronicity be retained at the point of correlation (the receiver end). In this paper we explore on- off-keying the MFL SOA in order to achieve a synchronous RZ pulse-train which can then be externally data-modulated. Particular emphasis was placed on determining the smallest achievable pulse-widths and highest pulse repetition rates for the MFLs, since the long MFL cavity lengths may preclude fast modulation formats.

Citation Download Citation

Antonio J. Mendez and John Michael Morookian "Return-to-zero (RZ) modulation of multifrequency lasers (MFLs) for application to optical CDMA", Proc. SPIE 4653, WDM and Photonic Switching Devices for Network Applications III, (7 June 2002); https://doi.org/10.1117/12.469637

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available