| 摘要 |
A multichannel parallel LD/PD module comprising a bench, a plurality of lightpaths having an initial narrow width region, an intermediate width enlarging region and a final wide width region, a plurality of photodiodes or a photodiode array mounted on the narrow width region, a wavelength selective filter formed on the narrow width region for selectively reflecting receiving beams, a plurality of light emitting devices fitted behind rear ends of the lightpaths on the bench. Traveling in element fibers in an outer ribbon fiber, receiving signal beams go into the lightpaths via front ends and are reflected by the wavelength selective filter slantingly upward at the narrow width region. The reflected beams go into the photodiodes and are converted into photocurrents in proportion to the receiving signals. Emanating from the light emitting devices, transmitting signal beams enter the lightpaths via final ends of the wide width region, propagate backward in the width enlarging region, arrive at the narrow width region, transfer to outer element fibers in a connector, and propagate in the ribbon fiber following the connector. Long distances between the transmitting portion (LDs or LEDs) and the receiving portion (PDs) suppress optical, electromagnetic and electric crosstalk between the light emitting devices and the photodiodes. |
