| 摘要 |
A parallel multichannel LD/PD module comprising a bench, a set of M (M; channel number) curving lightpaths (lightwaveguides or optical fibers) having a narrow width region, a width enlarging region and a wide width region which are formed upon the bench, a wavelength selective filter provided at the wide width region for reflecting receiving beams upward, a set of photodiodes installed in front of the wavelength selective filter at the wide width region above the bench and light emitting devices mounted behind the ends of the lightpaths with a wide pitch for yielding transmitting beams. Propagating in outer M-channel element fibers of a ribbonfiber, receiving signal beams go into the lightpaths via the narrow width region, expand horizontally in the width enlarging region, arrive at the wide width region, and are reflected by the wavelength selective filter upward. The receiving beams go into the photodiodes which yield photocurrents in proportion to the powers of the receiving beams. Transmitting signal beams produced by the light emitting devices (LDs or LEDs) go into the lightpaths via the wide width region ends, run in the lightpaths, go out of the lightpaths from the narrow width region ends and go into M element fibers of an external ribbonfiber. An enlarging rate D/d should be 1.5 to 6. The wide width region enables the module to accommodating laser diodes with a sufficient margin, which lowers electric crosstalk among the laser diodes. Long distances between the photodiodes and the laser diodes alleviate optical, electromagnetic and electric crosstalk between the photodiodes and the laser diodes.
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