Integrated optical multiplex-demultiplex module for optical communications transmission
US4760569A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1986 |
| Grant date | Jul 26, 1988 |
| Priority date | — |
| Expiry date | Dec 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0216
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multiplex-demultiplex module having a laser diode and a strip waveguide leading from said laser diode being disposed on a first surface of a substrate and the waveguide extends to an out-coupling and in-coupling location characterized by a single combined grating being arranged on the first surface of the substrate having its grid lines extending perpendicular to the direction of radiation guided in the waveguide and dimensioned so that it will not influence the laser emissions of a first wavelength from the laser diode but will steer radiation supplied from an in-coupling location and having a second wavelength differing from the first wavelength through the substrate onto a photo diode located under the opposite surface of the substrate. The grating thus acts as both a frequency-selective and a diffracting grating and replaces the two gratings in previously known devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.