Importance

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Abstract

The present invention provides an optical signal add/drop apparatus comprising: an optical signal multiplexing/demultiplexing portion comprising a plurality of 2.times.2 channel unit devices which are arranged in a straight line and having first and second dual-core ferrules having two optical fibers disposed to be symmetrical to each other at an identical distance from an optical axis for transmitting optical signals, a wavelength division filter disposed between first and second lenses for selectively transmitting or reflecting only the optical signals having specific wavelengths, first and second grin lenses for collimating or focusing the optical signal transmitted or reflected from said wavelength division filter and then transmitting the signal to the first and second dual-core optical fibers; and a switch module having unit 2.times.2 switches connected to two optical fibers of the second dual-core ferrule of each of the unit devices of said optical signal multiplexing/demultiplexing portion; wherein the switch module can drop simultaneously the optical signals demultiplexed on each of the unit devices or transmit them to the output channels continuously according to the connection state of each of 2.times.2 switches of the switch modules and then transmit them to output channels through each of the unit devices when the optical signals are added.

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First Claim