Patent ID: 9250129
Filing Date: 2016-02-02
CPC Classification: G01J,G02B

Claim Text:
1. An optical filter device comprising: a transmission wavelength tunable interference filter that outputs a light having a specific wavelength, wherein a given wavelength of a light outputted by the transmission wavelength tunable interference filter is based on a gap between mirrors disposed on substrates opposite to each other and controlled by an electrostatic actuator; a tunable etalon driver circuit that drives the transmission wavelength tunable interference filter to change the gap between the mirrors; a light receiving device that receives the light output from the transmission wavelength tunable interference filter and outputs a current; an I-V convertor circuit connected to the light receiving device and converts the current to a voltage; an amplifier circuit connected to the I-V convertor circuit and having a gain switching function, wherein the amplifier circuit includes a multiplexer, and the amplifier circuit amplifies the voltage provided by the I-V converter circuit; an AD convertor connected to the amplifier circuit and converts the voltage amplified by the amplifier circuit to a digital signal; a microprocessor connected to the amplifier circuit and the AD convertor, the microprocessor receives the digital signal from the AD convertor and controls the gain switching function of the amplifier circuit; and a voltage setting memory connected to the microprocessor and stores a gain table, the gain table defines corresponding relationships between an output voltage of the amplifier circuit and a signal of the multiplexer disposed within the amplifier circuit, wherein