Method, circuitry and apparatus for outputting a stable optical signal in a dense wavelength division multiplexing device during fast changes of operating conditions
US8606111B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2011 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Sep 14, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/1332
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The disclosure relates to a fast, stable method of output wavelength control in a DWDM optical device, and a circuit configured to perform the method. The method and circuit can control timing and overshoot during conditions of rapid operational changes, such as during power-on or restart of the device. The method and circuit includes optimized APC, TEC and electro-absorption (EA) modulator control hardware and algorithms, to effectively control transient processes. Software and circuitry based on the method(s) are achieved in part by optimizing APC, EA and TEC control algorithms. In combination with hardware/circuit optimization, one can achieve fast turn-on of an optical output signal at a stable wavelength. The method and circuit provides a stable power-up process in which a change of wavelength is small enough to meet DWDM specification requirements, to ensure the elimination and avoidance of crosstalk in adjacent channels in dense wave (sub)systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.