The present invention relates to a high-speed single-phase condensed time-division multiplexing / demultiplexing which is a type of optical communication device.;Especially, it is shown that the conventional optical fiber multi-stage configuration uses a special component or a few common components to configure a demultiplexer.;Unlike the conventional method using a 3 dB separator / combiner as a demultiplexer / combiner of a Sagnac interferometer used as a demultiplexer, a phase change induced in the interferometer using a polarization splitter / . The signal light traveling to the interferometer arm is perpendicular to each other, and the modulated light induces a non-forming refractive index in only one of the two modulated lights, and the changed phase change is finally separated by the polarization separator / coupler by changing the polarization degree of the signal light by 90 .;In this case, a half wave plate (optical fiber polarization controller) is used to facilitate separation of the control light and the signal light.;The core of the present invention is an optical fiber duplexer composed of light sources and a small number of general optical fiber elements suitable for communication for a long wavelength (1.5 mu m) and comparatively practical.
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