| 摘要 |
Light radiating from a multimode optical waveguide is coupled to the input ends of a plurality of optical waveguide mode discriminators, each of which has a light detector for receiving light radiating from the output thereof. The first mode discriminator propagates only the lowest order mode propagated by the multimode waveguide, the second mode discriminator propagates only the lowest and second lowest order modes, and so on. The amplitudes and phases of the lowest order mode signals provided by the detectors associated with the first and second mode discriminators are equalized and these two equalized signals are coupled to a substracter circuit which cancels the lowest order mode signals and provides a signal representative of the information propagated by the second lowest order mode. In a similar manner the information propagated by higher order modes can be obtained.
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