Bidirectional optical fiber transmission system
AssigneeNippon Electric Co., Ltd.
InventorsShigetoki Sugimoto, Kouichi Minemura
Life of this patent
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Abstract
There is disclosed a bidirectional optical fiber transmission system. This system includes first and second light transmitter-receiver sets and a single strand of optical fibers. The light transmitter-receiver sets each comprise (a) a light receiver, (b) a light transmitter whose light source is a light emitting diode, and (c) means to isolate downstream and upstream light from each other. The optical fibers connect the light-transmitter-receiver sets through the light isolating means. The emission spectra of the light emitting diodes at least partly overlap each other and the isolating means have wavelength pass bands which do not substantially overlap each other.
Claims6
A bidirectional optical fiber transmission system comprising
- a first transmitter-receiver set comprising of a firsst light receiving means, a first light transmitting means which has a first light emitting diode as light source, and a first downstream-upstream dividing means which has a short wavelength pass filtering means to filter the part of the spectrum, emitted by said first light emitting diode, shorter in wavelength than a prescribed value and another filtering means to pass the light to be received, and separates the light to be transmitted and that to be received;
- a second transmitter-receiver set comprising of a second light receiving means, a second light transmitting means which has, as light source, a second light emitting diode whose emission spectrum at least partly overlaps that of said first light emitting diode, and a second downstream-upstream dividing means which has a long wavelength pass filtering means to filter the part of the spectrum, emitted by said second light emitting diode, longer in wavelength than the prescribed value and another filtering means to pass the light to be received, and separates the light to be transmitted and that to be received, and
- an optical fiber transmission path to connect said first and second transmitter-receiver sets.
Dependencies are inferred from the claim text.