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1. (WO2017148937) WAVEGUIDE-INTEGRATED TUNEABLE OPTICAL FILTER

Pub. No.:    WO/2017/148937    International Application No.:    PCT/EP2017/054631
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: G02B 6/12
G02B 6/293
Applicants: UNIVERSITY OF COPENHAGEN
Inventors: MIDOLO, Leonardo
STOBBE, Søren
LODAHL, Peter
Title: WAVEGUIDE-INTEGRATED TUNEABLE OPTICAL FILTER
Abstract:
A tuneable optical filter (10, 110, 210, 310, 410) comprising an input waveguide (12, 412), an optical power coupler (14, 414), and two substantially parallel photonic crystal waveguides (16, 416; 18, 418) is disclosed. The optical power coupler (14, 414) is optically coupled between the input waveguide (12, 412) and the two parallel photonic crystal waveguides (16, 416; 18, 418), and the optical power coupler (14, 414) is adapted to split incoming light from the input waveguide (12, 412) into two in-phase light outputs, which are coupled to the two parallel photonic crystal waveguides (16, 416; 18, 418). The tuneable optical filter further comprises an actuator (36, 136, 236, 336, 436), which is arranged and adapted to be able to vary a spacing (d) between the two waveguides (16, 416; 18, 418).