Optical waveguide multiplexer for optical fiber amplifiers
US5457558A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jun 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29367
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical waveguide multiplexer for use in optical fiber amplifiers or the like, which is simple in configuration, permits manufacturing at high productivity, and is reduced in size and moreover susceptible to little insertion loss, is to be realized. A multiplexer-branching filter is provided with first to fourth input/output (I/O) terminals. Part of an optical signal emitted from the first I/O terminal is reflected by a branching film, formed over one face of a glass plate, and led to the second optical I/O terminal. The rest of the optical signal penetrates the glass plate, and further penetrates an optical multiplexing film, formed on the other face, to be led to the third optical I/O terminal. The invention has a particular characteristic that the thickness t of the substrate is set so as to satisfy the condition of t.gtoreq.w/cos.theta..times.tan[sin.sup.-1 {(sin.theta.)/n}] where n is the refractive index of the substrate; w, the beam diameter of the output light of the optical I/O terminal for multiplexing the signal light with an pomping light; and .theta., the angle of incidence from this terminal to the substrate. By setting the substrate thickness at or above the value…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.