Edge interference filter for optical communication transmission in wavelength-division multiplex
US4726655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Sep 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/285
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An edge interference filter transmitting short-wave for great interchannel spacing of about 200 nm given an attenuation band wavelength of about 1300 nm. The filter is composed of a layer sequence of a total of 23 alternately high and low refractive index layers wherein the high index of refraction layers have an index of refraction of 2.08 and the low index of refraction layers have an index of approximately 1.45, the effective optical layer thickness of the individual layers is standardized to a 20.degree. angle of incidence and to 1/4 wavelength of the attenuation band center wavelength of 1260 nm with to layers 1 and 23 having a thickness of 1.146, layers 2 and 22 having a thickness of 0.909, layers 3 and 21 having a thickness of 1.039, layers 4 and 20 having a thickness of 0.932 and layers 5-19 having a thickness of 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.