System for suppression of relative intensity noise in a...

Details System for suppression of relative intensity noise in a... System for suppression of relative intensity noise in a...

G - Physics

01

C

G01C 19/72 (2006.01)

Patent

CA 2358918

A system is disclosed which suppresses relative intensity noise in a fiber optic gyroscope. A high-speed intensity modulator is placed in the gyroscope light path between the fiber light source and a tap coupler which provides a sample of the modulated signal for use in a feedback loop. A photodetector receives the sampled signal and provides current-to-voltage conversion of the signal. A high-bandwidth voltage amplifier then adjusts the gain and phase of the converted signal and drives the intensity modulator in such a manner as to stabilize the control loop and provide suppression of relative intensity noise. The present system modulates the intensity of the light at a frequency which is sufficiently high to allow suppression of high frequency components of the relative intensity noise.

Cette invention a trait à un système permettant de supprimer un bruit d'intensité relative dans un gyroscope à fibre optique. Un modulateur d'intensité grande vitesse se trouve sur le parcours lumineux du gyroscope, entre la source de lumière à fibre et un coupleur de prise fournissant un échantillon du signal modulé à utiliser dans une boucle de rétroaction. Un photodétecteur reçoit le signal échantillonné et assure une conversion courant-tension du signal. Un amplificateur de tension grande largeur de bande adapte alors le gain du signal converti et agit sur le modulateur d'intensité de manière à stabiliser la boucle de rétroaction et à supprimer le bruit d'intensité relative. Ce système permet de moduler la lumière à une fréquence suffisamment haute pour permettre la suppression de composantes haute fréquence du bruit d'intensité relative.

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