Telecommunication system with fiberguide signal filtering

Details Telecommunication system with fiberguide signal filtering Telecommunication system with fiberguide signal filtering

1981-04-24

1984-07-17

Moore, David K.

350 9618, G02B 5172

Patent

active

044602413

ABSTRACT:
The application pertains to fiberguide systems comprising signal sources having center wavelengths near an absorption peak in the loss spectrum of the fiber, with the systems having a link length of several km, preferably at least 5 km. The resulting "filtering" of the signal can be used advantageously. For instance, the repeater spacing of a LED-based multimode system can be increased if fiberguide having an absorption peak of appropriate strength located above the minimum chromatic dispersion wavelength of the fiber is used, and if the LED center wavelength is chosen to exceed that wavelength by a small amount. In particular, in silica-rich fiberguide, absorption peaks due to OH typically occur at about 1.24 .mu.m and 1.39 .mu.m, and the wavelength of minimum chromatic dispersion can be about 1.3 .mu.m. In such systems according to the invention, the total fiber loss at 1.39 .mu.m is typically at least about 0.5 dB/km above the background loss, and the center wavelength exceeds the minimum chromatic dispersion wavelength by at least about 10% of the signal spectral width, or about 0.01 .mu.m, whichever is less. The filtering resulting from the presence of the two absorption peaks results in a narrowing of the signal spectrum, which in turn leads to, inter alia, an increase in the bandwidth of the fiberguide system, as is demonstrated by exemplary results. The filtering effect typically can also be advantageously applied in a variety of other situations, including, for instance, wavelength-multiplexed systems.

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