Self-tuning optical waveguide filter

A self-tuning optical waveguide filter (20) for attenuating a lower power light signal at lambda 1 more than a higher power signal at lambda 2 comprises a length of single core (27) waveguide (11) and a light injector (12) for applying lambda 1, lambda 2 into the waveguide in two propagating modes s...

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Bibliographische Detailangaben
Hauptverfasser:	WANG, JAU-SHENG, VENGSARKAR, ASHISH MADHUKAR, STOLEN, ROGERS HALL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A self-tuning optical waveguide filter (20) for attenuating a lower power light signal at lambda 1 more than a higher power signal at lambda 2 comprises a length of single core (27) waveguide (11) and a light injector (12) for applying lambda 1, lambda 2 into the waveguide in two propagating modes subject to mode beating. The mode beating produces high intensity regions of lambda 1 physically displaced from high intensity regions of lambda 2. A portion (15) of the waveguide (11) is doped with a saturable absorber for disproportionately attenuating wavelengths at lower power levels. Advantageously the waveguide is a single-core fiber having its central core doped with rare-earth saturable absorber. In a preferred embodiment, the fiber is dimensioned to propagate lambda 1, lambda 2 in the LPO1, and LPO2 modes, and the saturable absorber is Erbium.