TRANSMISSION LOSS REDDUCING METHOD AND APPARATUS, TRANSMISSION LOSS COMPENSATOR AND SYSTEM FOR WAVELENGTH DIVISION MULTIPLEX SYSTEM PASSIVE OPTICAL NETWORK

摘要

PROBLEM TO BE SOLVED: To provide a frequency division multiplex system passive optical network system utilizing optical signals wavelength-locked to incoherent light which suppresses the optical loss to minimum and improves transmission quality and a transmission distance.

SOLUTION: A central base station comprises a 2×N optical multiplexer/demultiplexer 610, first and second 1×2 space type optical switches 614, 615, and a 4-terminal optical route setting unit 613. A first optical cable 616 for connection in a normal state, and a second optical cable 617 for detouring at recovery from troubles are provided between the central base station and a remote branch node, and the remote branch node comprises a 2×N optical multiplexer/demultiplexer 618.

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