Cold-start wavelength-division-multiplexed optical transmission system
US6349103B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/4087
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cold-start wavelength-division-multiplexed (WDM) optical transmission system uses a synchronized etalon filter, DFB lasers and passive optical demultiplexers. The DFB lasers are tested under normal operating conditions and wavelength-selected for each channel. The wavelength selection is such that the laser operates within one half of the channel spacing from the standardized wavelength. For the cold-start operation, each laser is able to automatically find its operating wavelength without any prior knowledge of its operating conditions for the standardized wavelength. In addition, this system simultaneously adjusts the output power of each laser to a desired value. Also provided is a method for generating standardized frequencies for a wavelength-division-multiplexed optical transmission system, including the step of adjusting the incident angle of an etalon filter by employing two frequency-locked lasers to compensate for differences of the thickness and refractive index of the etalon filter, and the step of fixing the position of the etalon filter to permanently have the adjusted incident angle, the etalon filter having resonant frequencies respectively corresponding to standa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.