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Bidirectional Double Wavelength Optical Bus Network Using Doped Fiber Amplifiers

IP.com Disclosure Number: IPCOM000101557D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Liu, K: AUTHOR [+2]

Abstract

In the preceding article a unidirectional optical bus network using doped fiber amplifiers was proposed. In this disclosure, we describe a variation of this scheme that uses the bidirectional amplification capabilities of fiber amplifiers to reduce the number of passive taps in the network by half. This is, however, obtained at the cost of using two transmitters and receivers at each station.

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Bidirectional Double Wavelength Optical Bus Network Using Doped Fiber Amplifiers

       In the preceding article a unidirectional optical bus
network using doped fiber amplifiers was proposed.  In this
disclosure, we describe a variation of this scheme that uses the
bidirectional amplification capabilities of fiber amplifiers to
reduce the number of passive taps in the network by half.  This is,
however, obtained at the cost of using two transmitters and receivers
at each station.

      The architecture is shown in Fig. 1.  As in the preceding
article, a single pump source is used to pump all the doped fiber
amplifiers on the bus.  In this case, the passive taps must be
designed so that they allow the pump to go through and split only the
signals.  Otherwise, the pump will have to be filtered out at each
station.

      Each station has two transmitters, transmitting at wavelengths
g1 and g2, as shown in the figure. Wavelength g1 is used for
transmitting to stations towards the right of the bus and g2 for
transmitting to stations towards the left of the bus.  Similarly, two
receivers are required for receiving transmissions from either side
of the bus.  The two wavelengths are separated within the station by
using wavelength- sensitive directional couplers.

      The advantages of this scheme are as follows:
1.   The bidirectional bus topology enables a larger number of
stations to be supported than a unidirectional bus for the same power
budget...