Wavelength-Scanning Optical Bandpass Filters Based on Optomechatronics for Optical-Frequency Sweepers
Katagiri, Y.; Takesue, H.; Hashimoto, E.
Industrial Electronics, IEEE Transactions on
Volume 52, Issue 4, Aug. 2005 Page(s): 992 - 1004
Digital Object Identifier   10.1109/TIE.2005.851687
Summary: We propose and demonstrate a method for improving optical-frequency sweepers that uses a disk-shaped optical bandpass filter operated under the synchro-scan mode. We optimize the filter layer structure to achieve high linearity in optical-frequency tuning with the rotation angle of the disk, while maintaining a constant band-inhibition performance. We introduce an optical system that narrows the bandwidth by using an optimized beam coupler and improves the filtering performance by using a multiple-path method. The optimized filter enables a stable linear optical-frequency sweep when it is used with a motor stabilized by phase locking. The improved optical frequency sweepers can extend the sweep range to above 2 THz, while suppressing the accumulation of spontaneous emission noise.

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