Wavelength locking channel monitor
US6927377B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2003 |
| Grant date | Aug 9, 2005 |
| Priority date | — |
| Expiry date | Feb 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Prior art wavelength lockers used in tunable laser systems can provide information to ensure that the laser is locked onto a channel, but do not provide information as to which specific channel the laser is locked onto. Embodiments of the present invention include a wavelength locking channel monitor that provides a servo-locking error signal and a channel-identifying signal to allow a tunable laser to be updated to lock to the proper channel. Embodiments of the present invention include wavelength-dependent periodic and/or monotonic filters, which provide monotonically variable finesse and a monotonically variable transmission. Embodiments of the present invention also extracts amplitudes, phases, frequency, and/or modulation depths from a dither introduced in an incident light beam to determine the laser channel and the laser mode within that channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.