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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper WJ3

Multiwavelength ‘Single-Mode’ Erbium Doped Fiber Laser for FFH-OCDMA Testing

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Abstract

Optical code division multiple access (OCDMA) has recently raised a lot of interest for the development of access networks. Systems have been proposed based on direct sequence or frequency-encoding approaches.1,2 Fast frequency hopping (FFH) has also been considered to increase the system capacity using two-dimensional codes.3 In all these cases, fiber Bragg gratings technology is simple and reliable for the realization of the encoders. In a frequency-encoding system, interrogation of the encoder is traditionally performed by a broadband source. Incoherent sources like LEDs or superfluorescent emission from an erbium-doped fiber (EDF) can be used, but their output power is limited and the detected signal suffers from a high level of beat noise. Another approach is to use a short pulse laser, which is a rather complex system. If the encoder frequency bands are equally spaced, for example anchored on the 100 GHz ITU grid, an alternative solution is to use multiwavelength lasers, for example DFB laser arrays. For testing purpose, a single fiber laser source emitting multiple wavelengths, single-mode at each wavelength, is also of great interest.

© 2002 Optical Society of America

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