| 摘要 |
PCT No. PCT/GB98/01010 Sec. 371 Date May 20, 1998 Sec. 102(e) Date May 20, 1998 PCT Filed Apr. 6, 1998 PCT Pub. No. WO98/47041 PCT Pub. Date Oct. 22, 1998An optical modulator includes a bi-moded fiber for supporting first and second different optical transmission modes, coupled between input and output single mode fibers. The two modes in the bi-moded fiber interfere and the intensity of the radiation that passes to the single mode output fiber is a function of the relative phases of the first and second modes. The bi-moded fiber is electrically poled and is provided with modulating electrodes. When a modulating voltage from a modulating source is applied to the electrodes, the refractive index of the waveguide for the first transmission mode is altered relative to the refractive index of the waveguide for the second mode such as to change the phase difference between the modes at the entrance to the output fiber so as to control the intensity of optical radiation that passes through the output fiber.
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