INSTRUMENT AND METHOD FOR MEASURING WAVELENGTH DISPERSION

PROBLEM TO BE SOLVED: To provide a wavelength dispersion measuring instrument which is composed of a small number of components and will not cause the problem of optical SNR. SOLUTION: A low frequency fm is superposed on a high-frequency f1, and light of frequency fs is modulated and sent out to a t...

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Bibliographische Detailangaben
Hauptverfasser:	ISHIKAWA JOJI, IFUKURO SADAO
Format:	Patent
Sprache:	eng
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 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 LOGIC ELEMENTS OPTICS PHYSICS RADIATION PYROMETRY TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a wavelength dispersion measuring instrument which is composed of a small number of components and will not cause the problem of optical SNR. SOLUTION: A low frequency fm is superposed on a high-frequency f1, and light of frequency fs is modulated and sent out to a transmission line 24 as wavelength-dispersion measurement light. On a reception side, local oscillation light is multiplexed with the wavelength-dispersion measurement light, and heterodyne detection is carried out. Side bands generated by the modulation of a frequency f2 in the heterodyne-detected wavelength-dispersion measurement light are extracted by band-pass filters 28-1 and 28-2, and their phase difference is detected, to calculate the wavelength dispersion value of the transmission line 24.