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Proceedings Paper

Wavelength tunable receiver for FSK modulated optical signals based on standard direct-detection circuitry
Author(s): P. van Eijk; J. G.L. Jennen; Antonius A. Koonen
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Paper Abstract

A WDM system has been realized, intended for digital broadband (e.g. video) distribution in an optically splitted subscriber access network. Four standard 565 Mbit/s optical transmitter units have been equipped with wavelength-matched 1557 nm DFB laser diodes. The four transmitters are wavelength-locked to a temperature-stabilized fiber Fabry-Perot (FFP). The lasers are FSK modulated with a tone spacing of 6.7 GHz; the 565 Mbit/s input signals are 7B8B coded to avoid problems with the laser's non-linear FM response. Another tunable FFP precedes a standard direct-detection receiver for both wavelength channel selection and FSK demodulation. A wavelength control circuit (WCC) ensures locking of the FFP to the correct tone of the selected channel. The WCC continuously maximizes the average FFP output power, by determining the time-derivative of the mean photodiode current. The main advantage of this approach is the absence of a dithering signal, which interferes with the data signal. BER curves have been measured for each of the four channels and compared with theory, discrepancies are < 0.75 dB. A net system power budget of > 28 dB for each channel has been achieved, and no evidence for BER floors has been found down to a BER of 10-11.

Paper Details

Date Published: 22 February 1995
PDF: 6 pages
Proc. SPIE 2449, Fiber Optic Network Components, (22 February 1995); doi: 10.1117/12.201958
Show Author Affiliations
P. van Eijk, AT&T Network Systems Nederland BV (Netherlands)
J. G.L. Jennen, AT&T Network Systems Nederland BV (Netherlands)
Antonius A. Koonen, AT&T Network Systems Nederland BV (Netherlands)

Published in SPIE Proceedings Vol. 2449:
Fiber Optic Network Components
S. Iraj Najafi; Henri Porte, Editor(s)

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