Accurate agile wavelength optical source and use thereof

Details Accurate agile wavelength optical source and use thereof Accurate agile wavelength optical source and use thereof

H - Electricity

04

B

H04B 10/04 (2006.01) H04B 10/00 (2006.01) H04B 10/155 (2006.01) H04J 14/08 (2006.01)

Patent

CA 2339911

This disclosure applies to an improvement on conventional optical transmitter architecture which allows the production of bursts of data signals with accurate selectable optical frequency within the target optical band. The invention overcomes the limitation caused when the monitor and feedback circuits do not provide sufficient control within the required time. A key aspect of this invention is the ability to ensure the output frequency is well controlled, even for rapid changes in output frequency, as in packet on wavelength systems. Two approaches are discussed: one for cases when the laser cannot be tuned within an allowed switching time, and one which applies when the laser can be tuned sufficiently quickly but requires on-going stabilization. The second approach may be used to improve the performance of the first approach. The first approach, in which a single laser cannot tune accurately within the required time, makes use of multiple lasers implemented with an appropriately fast optical switch to select the desired laser, each laser being tuned and locked on the frequency required for the packet it will address while an other is (or others are) transmitting. In the second approach, in which a single laser can be tuned to the nominal frequency during the transition time, the implementation improves the initial spectral quality and frequency accuracy on switching to a new frequency through: -setting the initial frequency as determined by a set of parameters in a table, - improving the output quality during the data transmission, -updating the table parameters based on the changes necessary to improve the signal. The second approach is particularly appropriate for rapid cyclical requirements for a particular wavelength, as the conditions for any wavelength may be nominally unchanged from cycle to cycle. If the tunable lasers cover only a fraction of the desired optical band, multiple lasers may be operated in paralleled to provide full coverage of the wavelength band, and combined with a fast optical switch, while being controlled with either of the two control approaches. This disclosure also applies to the use of such rapidly tuned optical sources to provide data units, frames or packets where each data unit can be of arbitrary frequency within a set of operational frequencies.

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