Ando Electric Company

Seiji Funakawa

Nobuaki Ema

Akishige Ito

Tohru Mori

A wavelength-variable light source apparatus having a wavelength calibration function of emitted light therefrom. The apparatus includes a semiconductor laser light source section, an external resonance section having a reflection surface for externally resonating emitted light from the semiconductor laser light source section at a predetermined reflection wavelength, a drive section for moving a position of the reflection surface in the external resonance section for varying an external resonance condition, a control section for controlling a variable move distance of the reflection surface in the drive section, and a wavelength detection section comprising a gas cell having a wavelength absorption characteristic absorbing light at a plurality of specific wavelengths for sweeping light emitted from the external resonance section into the gas cell and detecting an absorption wavelength of the emitted light, wherein the control section controls the move distance of the reflection surface in the drive section based on the absorption wavelength detected by the wavelength detection section.

Wavelength-variable light source apparatus

Light under measurement whose wavelength is continuously swept is incident on fiber-optic Etalon. The fiber-optic Etalon transmits the light under measurement each time the wavelength of the light under measurement satisfies specific conditions. A PD detects the transmitted light of the fiber-optic Etalon and outputs the intensity of the light under measurement. A counter counts the number of peaks of the output of the PD. A CPU calculates the wavelength of the light under measurement based on the count value of the counter.

Wavelength measurement apparatus

Lenses and a diffraction grating a mirror a light isolator an arm a pulse motor and a pulse motor operate in conjunction for mechanically roughly adjusting the wavelength of laser light generated by an LD and the wavelength of laser light generated by the LD is electrically finely adjusted in a wavelength adjustment section

Wavelength-variable light source

In a tunable laser source device for branching a light output from a tunable laser source portion to supply to a wavelength measuring device and a wavelength calibrating reference device and then controlling the tunable laser source portion in response to an output of the wavelength measuring device, at least one peak and one notch or two peaks or two notches or more in a measurement interference period of the wavelength measuring device are included between a plurality of reference wavelengths of the wavelength calibrating reference device.

Tunable laser source device

A wavelength-variable light source apparatus having a wavelength measurement function for measuring the wavelength characteristic of an object to be measured. In the apparatus, a CPU outputs control signals for controlling components of a light power meter section via a bus for controlling a light detection operation. When the CPU obtains light detection level data detected by the light power meter section from light passing through an object to be measured, the CPU stores the light detection level data for each wavelength in the object to be measured in an RAM and causes a display control section to display the light detection level on a display section. Further, the CPU executes wavelength analysis processing according to a wavelength analysis program stored in an ROM, analyzes the light wavelength characteristic of the object to be measured based on the light detection level data for each wavelength stored in the RAM, and causes the display control section to display the analysis result on the display section.

In order to start sweeping an optical spectrum analyzer and a wavelength tunable light source on the same timing, a motor for driving a spectroscope in the optical spectrum analyzer is controlled. To this end, a drive circuit outputs a control signal to determine the timing where the motor starts to rotate. A wavelength control circuit in the wavelength tunable light source controls the sweep of the wavelength of single-mode oscillation from a light source unit and starts sweeping the light source unit in response to a signal externally supplied to control the timing of sweep start. As a result, the sweep of the wavelength being measured with the optical spectrum analyzer and that of the wavelength of single-mode oscillation from the wavelength tunable light source are started on the same timing and high-speed sweep is achieved.

Wavelength tracking system using an optical spectrum analyzer and a wavelength tunable light source

The present invention provides an external resonator light source which, by removing natural emitted light, is able to send out only light which has an extremely high wavelength purity. As shown in FIG. 1, the present invention's external resonator light source is provided with a light amplifying element ; a first light reflecting means disposed to the side of one outgoing light edge surface of the light amplifying element ; a wavelength selecting element disposed to the side of the other outgoing light edge surface of the light amplifying element ; and a second light reflecting means which reflects and/or transmits outgoing light from the wavelength selecting element , and which, together with the first light reflecting means , forms a light resonator; wherein outgoing light from the wavelength selecting element is output as transmitted light from the second light reflecting means

External resonator light source

A variable wavelength laser light source to improve the resolution of the outgoing light and output only pure laser light without the natural emitted light has an optical amplification element (laser) 11, a first optical reflector 12 at one end surface 11a of the optical amplification element 11, and a wavelength selection element (diffraction grating) 13 at the other end surface 11b of the optical amplification element 11 which selects and outputs the desired wavelength light emitted by the optical amplification element 11. A second optical reflector 14 receives the outgoing light from the wavelength selection element 13 to form the optical resonator with the first optical reflector 12. A first rotating mechanism 15 rotates the second optical reflector 14 around its axis, and a second rotating mechanism 16 connected to the first rotating mechanism 15 rotates the second optical reflector 14 around a second axis 16a remote from the second optical reflector 14 by rotating the first rotating mechanism.

Variable wavelength laser light source

A temperature controller of an optical module package comprises an optical element and first thermistor fixedly held over a first Peltier element housed in an optical module package with a base interposed therebetween; a second thermistor housed in the optical module package; and a second Peltier element with the optical module package fixedly attached thereon with a mount interposed therebetween. While temperature control of the optical module package is achieved by monitoring the temperature of the optical module package with the second thermistor and controlling the second Peltier element, temperature control of the optical element is achieved by monitoring the temperature of the optical element with the first thermistor and controlling the first Peltier element. The temperature controller of the optical module package is impervious to the effect of open air temperature and capable of saving required space.

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Tokyo, Japan

Seiji Funakawa