Switchable wavelength add/drop component
US5946430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Aug 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3508
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device for adding and/or dropping a signal to a transmission line. First and second optical circulators are connected by at least one switchable grating reflector, whereby a grating reflector can be switched into or out of the connecting path between the two circulators. A plurality of optical signals, each centered about a different wavelength, is coupled to a first port of the first circulator; these signals appear at the second port thereof. If a grating reflector capable of reflecting .lambda..sub.i is switched into the circuit, the signal centered about .lambda..sub.i propagates from the second port of the first circulator and reflects from the grating reflector back into the second port and out of the third port. The remainder of the input signals that are not reflected by grating reflectors propagate into the first port and from the second port of the second circulator as an output thereof. Also, a signal at wavelength .lambda..sub.i input to the third port of the second circulator propagates from the first port to the grating reflector where it reflects back to the second circulator and appears at the second port as an output thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.