Branching unit for telecommunications optical cable systems

Details Branching unit for telecommunications optical cable systems Branching unit for telecommunications optical cable systems

1994-06-01

1997-08-05

Bovernick, Rodney B.

Optical waveguides

With optical coupler

385 16, G02B 626, G02B 642

Patent

active

056550367

ABSTRACT:
An active branching unit for interconnecting three cables (two trunk cables and one spur cable) each including optical fibres. In a first interconnection configuration fibres of the trunk cables are connected together via the spur cable. Optical switch means, comprised for example by an erbium doped fibre amplifier (EDFA) (20) and an optical attenuator (21) in series, are disposed between optical fibres of the two trunk cables and are such as to pass telecommunications traffic between the trunk cables when, for example, there is fault in the spur cable and an alternative configuration is required. In this case a pump signal is applied to the EDFA (20) and the loss of the attenuator (21) overcome so that traffic can pass directly between the trunk cables and thus be diverted from the spur cable. This path switching can be achieved automatically.

REFERENCES:
patent: 5005937 (1991-04-01), Aida et al.
patent: 5280549 (1994-01-01), Barnard et al.

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