Optical passband filter

Details Optical passband filter Optical passband filter

1993-10-18

1995-10-24

Healy, Brian

Optical waveguides

With optical coupler

Plural

385 37, 385 27, 385 46, 359127, 359130, G02B 628, G02B 634

Patent

active

054616859

ABSTRACT:
An optical passband filter having a frequency transition that is several of orders of magnitude narrower than prior optical filters includes two frequency routing devices. The first frequency routing device has one input for receiving the input signal and at least N outputs, where N corresponds to the number of frequencies that compose the input signal. The N outputs of the first frequency routing device are each coupled to inputs of a second frequency routing device. The outputs of the second frequency device each correspond to one of the selected output frequency bands into which the input signal is to be divided. A multiplexed input signal containing several different frequency channels is divided into bands that are each directed to respective outputs of the second frequency routing device. The frequency transition between the various bands may be as small as the frequency resolution between adjacent outputs of the first frequency routing device.

REFERENCES:
patent: 5002350 (1991-03-01), Dragone
patent: 5136671 (1992-08-01), Dragone
patent: 5339157 (1994-08-01), Glance et al.
patent: 5373516 (1994-12-01), Glance et al.
patent: 5373517 (1994-12-01), Dragone et al.

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