Title :
LED-induced distributed Bragg reflection microwave filter with fiber-optically controlled change of center frequency via photoconductivity gratings
Author_Institution :
Inst. fuer Hochfrequenztech., Erlangen Univ., Germany
fDate :
2/1/1991 12:00:00 AM
Abstract :
A light-induced distributed Bragg reflection band-reject microwave filter is reported in which the grating elements are optoelectronically generated through periodic-structure photoexcitation of a silicon coplanar waveguide. The center for frequency can be optically adjusted to 11 GHz and 22 GHz by means of a pattern-controlled fiber bundle Array fed from six CW-operated 50-mW, 840-nm light emitting diodes (LEDs). Experimental results are in good agreement with theoretical predictions. The principle of operation demonstrated also applies to millimeter-wave integrated circuits
Keywords :
fibre optics; light emitting diodes; microwave filters; waveguide components; 11 GHz; 22 GHz; 50 mW; 840 nm; CPW; DBR type; SHF; Si coplanar waveguide; band-reject; centre frequency variation; distributed Bragg reflection; fiber-optically controlled change; light emitting diodes; microwave filter; optoelectronically generated grating elements; pattern-controlled fiber bundle Array; periodic-structure photoexcitation; photoconductivity gratings; Arrayed waveguide gratings; Bragg gratings; Light emitting diodes; Microwave filters; Microwave generation; Optical arrays; Optical fiber filters; Optical reflection; Optical waveguides; Silicon;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
