Cascaded grating resonator filters with external input-output co

Details Cascaded grating resonator filters with external input-output co Cascaded grating resonator filters with external input-output co

1977-08-25

1979-05-15

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

350 9612, 350162R, H03H 926, H03H 932, G02B 5124, G02B 526

Patent

active

041550560

ABSTRACT:
Acoustical and optical surface wave filters are described wherein the filter characteristic near resonance is provided by cascaded grating resonators. The out-of-band suppression for these resonators is provided by a track changing element that includes a four-port directional coupler having one port connected to receive input energy and a fourth port connected to couple energy into the cascaded grating resonators. Tapered and chirped reflection gratings are positioned so as to selectively reflect energy present at the second and third ports of the directional coupler. In a surface acoustic wave embodiment of the invention, the directional coupler is provided by a multistrip coupler. In an optical embodiment, the directional coupler function is provided by waveguiding structures that are brought sufficiently close to induce 3 dB coupling.

REFERENCES:
patent: 3578845 (1971-05-01), Brooks et al.
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3882430 (1975-05-01), Maerfeld
patent: 3883831 (1975-05-01), Williamson et al.
patent: 3965446 (1976-06-01), Craven et al.
patent: 4013983 (1977-03-01), Hartemann
patent: 4055820 (1977-10-01), Solie
Cross et al.-"Sidelobe Suppression in Corrugated Waveguide Filters" in Optics Letters, vol. 1, No. 1, Jul. 1977; pp. 43-45.
Haus et al.-"Transmission Response of Cascaded Gratings" in IEEE Trans. on Sonics and Ultrasonics, vol. Su-24, No. 2; pp. 94-101.
Marcatili-"Dielectric Rectangular Waveguide and Directional Coupler for Integrated Optics" in Bell System Technical Journal, Sep. 1969, pp. 2071-2102.

Affiliated with

Also associated with

Rating

Cascaded grating resonator filters with external input-output co does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cascaded grating resonator filters with external input-output co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cascaded grating resonator filters with external input-output co will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1100456