Tunable optical filter

Details Tunable optical filter Tunable optical filter

1995-10-27

1997-12-23

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Switch

385 24, 385 16, 359127, G02B 626

Patent

active

057013713

ABSTRACT:
The tunable optical filter comprises a pair of optical switches and an arrayed-waveguide grating router that has sixteen input waveguides and sixteen output waveguides. The frequency-division-multiplexed optical signal is directed through the first 1.times.4 optical switch to a selected input waveguide of the router so as to be demultiplexed into output waveguides of the router. The second 1.times.4 optical switch selects one of four output waveguides of the router so as to obtain a selected optical frequency. By appropriately connecting the switches with the input and output waveguides of the router, sixteen combinations of switch states correspond respectively to sixteen frequencies to be passed by the tunable optical filter. As a result, the filter can be tuned digitally to one of sixteen frequencies with small-size (1.times.4) optical switches. It is also possible to reduce the loss in the tunable optical filter because the optical signal is only required to make a single passage through the arrayed-waveguide grating router.

REFERENCES:
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patent: 5341444 (1994-08-01), Henry et al.
patent: 5373517 (1994-12-01), Dragone et al.
patent: 5414548 (1995-05-01), Tachikawa et al.
patent: 5488500 (1996-01-01), Glance
O. Ishida et al., FDM-Channel Selection Filter Employing an Arrayed-Waveguide Grating Multiplexer, Electronics Letters, vol. 30, No. 16, pp. 1327-1328, Aug. 4, 1994.
Osamu Ishida et al., Multichannel Frequency-Selective Switch Employing an Arrayed-Waveguide Grating Multiplexer with Fold-Back Optical Paths, IEEE Photonics Technology Letters, vol. 6, No. 10, pp. 1219-1221, Oct. 1994.
S. Suzuki et al., Multichannel Optical Wavelength Selective Switch With Arrayed-Waveguide Grating Multiplexer, Electronics Letters, vol. 30, No. 30, pp. 1091-1092, Jun. 23, 1994.
B. Glance et al., Applications of the Integrated Waveguide Grating Router, 8217 Journal of Lightwave Technology No. 6, pp. 957-961, Jun. 12, 1994.
Ishida et al., "Arrayed-Waveguide Grating Multiplexer with Fold-Back Optical Paths", Lecture Thesis Collection of the Electronic Data Collection Society, Lecture No. SB-8-8, pp. 617-618, 1994 June.
Glance et al., "Applicationa of the Integrated Waveguide Grating Router", Journal of Lightwave Technology, 12 (6):957-962 1994 June.

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