METHOD AND ARRANGEMENT IN CONNECTION WITH OPTICAL BRAGG-REFLECTORS

A method of establishing transmission of light through a chirped Bragg-reflector, a method of analysing the power spectrum of a light signal by means of a chirped Bragg-reflector, and an arrangement for analysing the power spectrum of a light signal. The Bragg-reflector reflects, in an unperturbed s...

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Bibliographische Detailangaben
Hauptverfasser:	STUBBE, RAOUL, BERGMAN, MIKAEL, SANDGREN, SIMON, SAHLGREN, BENGT, ASSEH, ADEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	COLORIMETRY 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 ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS RADIATION PYROMETRY TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING TRANSMISSION
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Beschreibung
Zusammenfassung:	A method of establishing transmission of light through a chirped Bragg-reflector, a method of analysing the power spectrum of a light signal by means of a chirped Bragg-reflector, and an arrangement for analysing the power spectrum of a light signal. The Bragg-reflector reflects, in an unperturbed state, essentially all incident light within a predefined wavelength range. The methods comprise the steps of directing the light to be analysed into an input end of a light guiding structure, such as an optical fibre, which light guiding structure is provided with a Bragg-reflector, and sending an acoustic pulse along said light guiding structure, thereby effectively lowering the reflectance of the Bragg-reflector for a certain wavelength at a certain time. By monitoring the light thus transmitted through the Bragg-reflector, power spectrum analysis of the incident light is obtained.