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New advances on optical components needed for FDM optical networks

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4 Author(s)
Glance, B.S. ; AT&T Bell Lab., Holmdel, NJ, USA ; Wiesenfeld, J.M. ; Koren, Uziel ; Wilson, R.W.

Two critical components, needed for optical networks based on frequency division multiplexing (FDM) and frequency reuse technologies, are presented. One is a fast tunable laser, yielding 24 discrete frequencies regularly spaced by 40 GHz around 1.53 μm. The laser can be switched randomly in less than 8 ns among these frequencies. Frequency routing of a 3-Gb/s bit stream in 10-ns packets between ten different destinations has been demonstrated with this laser. The second component is a broadband wavelength shifter capable of switching multigigabit data between optical frequencies in the 1.5-μm region. The device is tunable and cascadable, provides conversion gain, and is nearly polarization insensitive. Data degradation after wavelength shifting is negligible. Such a device provides the means of reusing the limited set of frequencies given by the lasers and thus of realizing large size networks

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 5 )