Integrated tunable optical filter

Details Integrated tunable optical filter Integrated tunable optical filter

1996-04-19

1997-04-15

Bovernick, Rodney B.

Optical waveguides

Integrated optical circuit

385 8, 385 10, 385 37, 372 50, G02B 612, G02F 1295

Patent

active

056218281

ABSTRACT:
An integrated tunable optical filter comprising a substrate made of a semiconducting material. The substrate includes first and second sections. The first section forms a tunable transmission filter, based on a codirectional coupler having a low selectivity. The second section forms a reflection filter with a reflection spectrum containing a number of peaks. A first injector, designed for current injection into said first section, is provided. Thus, the filter response of the first section is shifted in wavelength over a large wavelength range. There is also a second injector, designed for current injection into the second section. As a result, the reflective spectrum of the second section is slightly shifted in wavelength, in such a way that one reflection peak of the reflection spectrum corresponds to the coupling wavelength of the first section. Consequently, the total filter response has a very narrow bandwidth and wide tunability.

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