Low-loss high-impedance integrated fiber-optic tap.

Edward Harstead, Stuart D. Elby, Paul R. Prucnal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


A three-port passive optical tap which utilizes cladding modes in a single-mode fiber rather than core modes for tapped power is discussed. Cladding modes are induced by microbending so that a controlled continuously adjustable amount of power may be transferred from the core to the cladding. The cladding modes are tapped with low excess loss by a circularly symmetric notch etched into the cladding. The tapped light is collected by an integrated photodetector comprised of a p-n junction doped on the inside surface of a cylindrical hole etched completely through the chip. This geometry allows an optical fiber to be threaded through the chip without interruption and enables the integrated photodetector to efficiently capture the light which is emitted by the fiber tap situated within the hollow cylindrical well. This tapping technique has the unique property of exhibiting losses which reduce in proportion to the tapped signal. The implementation of this tapping technique in the novel integration of photodetector and fiber tap provides mechanical stability and compatibility with current VLSI technology, which may provide for assimilation of this device into existing telecommunication system designs.

Original languageEnglish (US)
Title of host publicationOpt Fiber Commun Conf 1988 Tech Dig Ser Vol 1 Summ Pap
PublisherPubl by Optical Soc of America
Number of pages1
ISBN (Print)1557520216
StatePublished - 1988
Externally publishedYes

Publication series

NameOpt Fiber Commun Conf 1988 Tech Dig Ser Vol 1 Summ Pap

All Science Journal Classification (ASJC) codes

  • General Engineering


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