KR102179521B1 - Dual variable-based oscillating optical frequency scanning laser light source and Apparatus for measuring using the same - Google Patents

Abstract

The present invention relates to a dual variable-based oscillation optical frequency scanning laser light source and a measuring device using the same to enable sequential scanning of oscillation laser output over an entire band wider than a channel band. The light source device includes: an optical gain unit for generating and amplifying light; a transmission broadband variable unit which selects a specific optical frequency band from the light generated from the optical gain unit and varies a transmission broadband to transmit the light; a resonant optical frequency variable unit for varying multiple resonant optical frequency orders within the specific optical frequency band over a variable range narrower than an interval between the respective orders; a resonant induction unit including the optical gain unit, the transmission broadband variable unit, and the resonance optical frequency variable unit and forming an optical resonator to selectively oscillate light of a specific resonant optical frequency within a specific transmission broadband; and a control signal unit for varying the transmission broadband variable unit and the resonant optical frequency variable unit respectively.

Description

Dual variable-based oscillating optical frequency scanning laser light source and Apparatus for measuring using the same}

The present invention relates to a laser light source and a measuring device, and specifically, a double variable-based oscillation optical frequency scanning laser light source and a measuring device using the same to enable sequential scanning of the oscillation laser output over an entire band wider than a channel band. It is about.

The oscillating optical frequency scanning light source is a light source that continuously or discontinuously changes the output optical frequency, and is widely used in technologies such as optical interferometer and optical frequency domain reflectometry, which generally use optical coherence. Has been used.

In general, optical frequency scanning light sources used in high optical interference-based optical measurement techniques are based on the principle of oscillating at a specific order among resonant optical frequencies that are inversely proportional to an integer multiple of the optical resonator length.

Therefore, the laser output output by scanning the resonant optical frequency has been using an optical frequency scanning light source within a single band, which is implemented only within a fixed band in which the band of the corresponding optical frequency cannot be changed, and this has the disadvantage that it is difficult to obtain information on multiple channels. have.

In the optical transmission system, different optical frequency bands are matched to different channels by dividing into multiple channels and using a wavelength division multiplexing technique to transmit an optical signal, thereby transmitting or acquiring information on multiple channels. Has been developed.

However, it is difficult to apply the wavelength division complex method due to the operating characteristics of a general optical frequency scanning laser light source in which the laser oscillation output band is fixed only in a specific optical frequency band and oscillates.

In another channel-specific optical signal transmission method, a single-band optical frequency scanning method using a delayed optical fiber element is divided by several times (buffering effect), which is a time division complex that receives information from different channels with a time difference. There is a multiplexing method, which has been used to transmit or receive information for multiple channels by dividing it over time.

However, such a method is influenced primarily by the output characteristics of the light source such as the scanning speed and duty cycle of the optical frequency scanning light source, thereby requiring precise adjustment and it is very difficult to actively change the output characteristics.

In consideration of such matters, in order to actively transmit or receive information for a plurality of channels, it is more preferable to generate channel division in an original light source rather than a transmission method.

Accordingly, there is a need to develop a laser light source capable of sequentially scanning the oscillation laser output over an entire band wider than the channel band.

Republic of Korea Patent Publication No. 10-2016-0011099 Korean Patent Registration No. 10-1844031 Korean Patent Registration No. 10-0766187

The present invention is to solve the problems of the conventional laser light source and measuring device, a dual variable-based oscillation optical frequency scanning laser light source that enables sequential scanning of the oscillation laser output over the entire band wider than the channel band And a measuring device using the same.

The present invention is a double-variable-based oscillation optical frequency scanning laser light source in which the optical frequency of the laser light oscillating from the optical resonator scans over time as the selection of the transmission optical frequency band and the selection of the resonant optical frequency are double. Its purpose is to provide a measuring device.

The present invention provides a dual variable-based oscillation optical frequency scanning laser light source and a measuring device using the same, which enables sequential scanning of the oscillation laser output over the entire band wider than the channel band, thereby actively changing the output characteristics. It has its purpose to provide.

In the present invention, by controlling both the scanning of the optical frequency within a specific narrow channel band and the scanning of the channel band itself in which the scanning occurs, it is possible to sequentially scan the oscillation laser output over the entire band wider than the channel band. An object of the present invention is to provide a double variable-based oscillation optical frequency scanning laser light source and a measuring device using the same.

Other objects of the present invention are not limited to the objects mentioned above, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

The dual variable-based oscillation optical frequency scanning laser light source device according to the present invention for achieving the above object comprises: a light gain unit that generates and amplifies light; a light by selecting a specific optical frequency band from the light generated from the light gain unit Transmitted broadband variable unit that is variable so as to transmit; A resonant optical frequency variable unit configured to vary so that several resonant optical frequency orders within the specific optical frequency band change over a variable range narrower than the interval between the respective orders; The optical gain unit, the transmission broadband variable A resonance induction unit for forming an optical resonator to selectively oscillate light of a specific resonant optical frequency within a specific transmission broadband including a resonant optical frequency variable unit; a control signal unit for varying the transmission broadband variable unit and the resonance optical frequency variable unit; It characterized in that it comprises a.

Here, by the control signal unit, the selection of the transmission optical frequency band and the selection of the resonant optical frequency are doubled, so that the optical frequency of the laser light oscillating from the optical resonator is scanned over time.

And the condition that the specific transmission broadband width selected to pass the light in the transmission broadband variable part is a condition that the bandwidth is narrower than the optical frequency range of the light gain part, and the condition that the bandwidth is wider than the optical frequency variable range of the resonant optical frequency variable part. At the same time, it is characterized in that the coherence of the laser light is increased by the light gain limiting effect by the transmission broadband selection, and the resonance optical frequency variable range is still maintained without decreasing.

And the time required for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range, and the time required for the transmission broadband width to select and vary the resonant optical frequency order by the transmission broadband variable part on a discontinuous periodic basis are intersected with each other. As it occurs periodically, the optical frequency of the laser light oscillating from the optical resonator is sequentially scanned over time.

And as the time required for continuously varying the central optical frequency of the transmission broadband including the resonant optical frequency order is longer than the time required for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range, the transmission It is characterized in that the optical frequency of the laser light oscillating from the optical resonator is sequentially scanned over time by including the optical frequency range in which the resonant optical frequency order is variable within the optical frequency range of which the broadband continuously varies.

In addition, the resonant optical frequency variable unit is characterized in that the resonant optical frequency of a specific order oscillated from the light source is varied by varying the mutual mode interval of the multiple order end mode spectrum of the light source by varying the optical path length of the optical resonator. .

And the transmission broadband variable part, by varying the light transmission and light loss spectrum bands to select a specific order end mode band from among several order end mode spectrums of the light source, to a degree wider than the variable range of the resonant optical frequency oscillated from the light source. It characterized in that the oscillation optical frequency of the specific resonant optical frequency of the band is varied.

In addition, the resonance induction part is characterized in that the resonance induction part is arranged by an optical element added by an optical fiber coupler or a spatial beam splitter so that the optical resonator structure forms an annular structure.

In addition, the resonance induction part is characterized in that the resonance induction part is arranged by an optical element added by an optical fiber coupler or a partial reflection mirror so that the optical resonator structure has a linear structure.

In addition, the optical resonator is characterized in that it is a rare earth-doped fiber amplifier, a stimulated Raman fiber amplifier, or a semiconductor optical amplifier.

In addition, the resonant optical frequency variable part is an electro-optic phase modulator, an electro-optic refractive index changer, or a liquid crystal retarder.

In addition, the transmission broadband variable part is an acousto-optic tunable filter or a Fabry-Perot tunable filter.

In addition, the transmission broadband variable part includes a diffraction grating part that disperses at different angles according to the optical frequency of the incident light, and an angle scan that feeds back only a specific optical frequency by reflecting light transmitted from the diffraction grating part at an arbitrary angle. It characterized in that it is composed of a reflector.

In the measuring apparatus using the oscillating optical frequency scanning laser light source based on the double variable according to the present invention for achieving another object, the selection of the wide band by the transmission wide band variable part and the variable of the optical frequency selection by the resonance optical frequency variable part are double. An oscillation optical frequency scanning laser light source unit in which the optical frequency of the laser light oscillating as it rises is sequentially scanned; a channel scanning unit that causes some light transmitted from the oscillation optical frequency scanning laser light source unit to vary different channels according to selection of a specific transmission broadband ; A diagnostic reflector in which the diagnosis target is positioned so that light is transmitted from the channel scan unit and reflected from the target to be diagnosed; The remaining light reflected from the diagnostic reflector and transmitted back is transmitted from the oscillation optical frequency scanning laser light source unit. Including: an optical interferometer unit for inducing an optical interference signal by interfering with some light; an optical measuring unit for acquiring information on a diagnosis target according to a variable frequency selection oscillation from the optical interference signal transmitted from the optical interferometer. It is characterized by that.

In order to achieve another object, the measuring apparatus using the double variable-based oscillation optical frequency scanning laser light source according to the present invention has a double variable selection of a broadband by a transmission broadband variable part and a variable selection of optical frequency by a resonant optical frequency variable part. The oscillation optical frequency scanning laser light source unit in which the optical frequency of the oscillating laser light is sequentially scanned by occurring as a result; the space is divided into different angles according to the diffraction reflection or dispersion reflection according to the selection of the optical frequency band by the resonance optical frequency variable unit. A channel scan unit that performs light scan for each angle in a non-mechanical manner so as to proceed through; a diagnosis reflector in which the diagnosis target is located at a distance so that light is transmitted to the free space and reflected into the free space from the target to be diagnosed; an optical interference signal Optical interferometer for inducing; Optical frequency selection by the resonant optical frequency variable An optical measurement unit for scanning and measuring spatial information of a diagnosis object corresponding to a channel for each angle different from the optical interference signal according to the oscillation variable over time; It characterized in that it includes.

In order to achieve another object, the measuring apparatus using the double variable-based oscillation optical frequency scanning laser light source according to the present invention has a double variable selection of a broadband by a transmission broadband variable part and a variable selection of optical frequency by a resonant optical frequency variable part. The oscillation optical frequency scanning laser light source unit in which the optical frequency of the oscillating laser light is sequentially scanned by the resonant optical frequency variable unit; the light of different optical frequencies according to the selection of the optical frequency band by the resonant optical frequency variable unit is divided according to the optical frequency channel division. A channel scanning unit that proceeds to the optical fiber to transmit and acquire multi-channel information; a diagnostic reflector in which the diagnosis object is located so that light is transmitted to the optical fiber and reflected by the optical fiber from the object to be diagnosed; an optical interferometer unit that induces an optical interference signal And an optical measurement unit for scanning and measuring optical fiber information of a diagnosis target corresponding to channels for different optical frequencies over time in an optical interference signal according to an optical frequency selection oscillation variable by a resonance optical frequency variable unit; To do.

In order to achieve another object, the measuring apparatus using the double variable-based oscillation optical frequency scanning laser light source according to the present invention has a double variable selection of a broadband by a transmission broadband variable part and a variable selection of optical frequency by a resonant optical frequency variable part. An oscillation optical frequency scanning laser light source unit for sequentially scanning the optical frequency of the oscillating laser light by rising to; a channel scanning unit that causes the light transmitted from the oscillation optical frequency scanning laser light source unit to vary different channels according to the selection of a specific transmission broadband ; Diagnostic reflecting unit in which the diagnosis target is positioned so that light is transmitted from the channel scanning unit and reflected from the target to be diagnosed; Light that is reflected from the diagnosis reflecting unit and converts a change in the intensity of light transmitted back into an electric signal by time. It characterized in that it comprises a; detection unit; Optical measurement unit for acquiring the spectrum information of the light for each optical frequency of the diagnosis target from the change of the electrical signal for each time transmitted from the light detection unit.

The dual variable-based oscillation optical frequency scanning laser light source and a measuring device using the same according to the present invention as described above have the following effects.

First, it provides a dual variable-based oscillation optical frequency scanning laser light source that enables sequential scanning of the oscillation laser output over an entire band wider than the channel band.

Second, since the selection of the transmission optical frequency band and the selection of the resonant optical frequency are doubled, the optical frequency of the laser light oscillating from the optical resonator is scanned over time, so that the output characteristics can be actively changed.

Third, it enables the sequential scanning of the oscillation laser output over the entire band wider than that of the channel, so that the output characteristics can be actively changed, thereby enabling efficient measurement.

Fourth, by controlling both the scanning of the optical frequency within a specific narrow channel band and the scanning of the channel band itself in which the scanning occurs, it is possible to sequentially scan the oscillation laser output over the entire band wider than the channel band. do.

1 is a configuration diagram of an oscillating optical frequency scanning laser light source device based on a double variable according to the present invention
2A to 2C are spectral configuration diagrams of a double variable-based oscillation optical frequency scanning laser light source device according to the present invention.
3A and 3B are graphs of variable characteristics of an optical frequency band selectively oscillated by a transmission broadband variable unit
4A and 4B are graphs of variable characteristics of an optical frequency band selectively oscillated by a resonant optical frequency variable unit
5A to 5C are graphs showing the sequential variable principle
6A to 6C are graphs showing the continuous variable principle
7 is a graph of sequentially variable characteristics
8 is a graph of simultaneous variable characteristics
9 to 12 are configuration diagrams of a measuring device using a light source device according to the present invention

Hereinafter, a preferred embodiment of a double variable-based oscillating optical frequency scanning laser light source and a measuring device using the same according to the present invention will be described in detail as follows.

Features and advantages of the double variable-based oscillation optical frequency scanning laser light source and a measuring device using the same according to the present invention will be apparent through detailed description of each embodiment below.

1 is a configuration diagram of an oscillation optical frequency scanning laser light source device based on a double variable according to the present invention.

In the double variable-based oscillation optical frequency scanning laser light source and a measuring device using the same according to the present invention, the optical frequency of the laser light oscillating from the optical resonator is timed as the selection of the transmission optical frequency band and the selection of the resonance optical frequency are double. The output characteristics can be actively changed by scanning according to the following.

To this end, the present invention controls both the scanning of the optical frequency within a specific narrow channel band and the scanning of the channel band itself in which the scanning occurs, thereby sequentially scanning the oscillation laser output over the entire band wider than the channel band. It may include a configuration that makes this possible.

The dual variable-based oscillation optical frequency scanning laser light source device according to the present invention includes a light gain unit 10 for generating and amplifying light over a plurality of wide light frequency ranges, and the light gain unit 10 as shown in FIG. 1. ), a transmission broadband variable part 30 that selects a specific optical frequency band from among the light generated from the light to be transmitted, and various resonant optical frequency orders within the specific optical frequency band change over a variable range narrower than the interval between each order The resonant optical frequency variable unit 20 that is variable to be adjusted, the optical gain unit 10, the transmission broadband variable unit 30, the resonance optical frequency variable unit 20, including a specific resonance optical frequency within a specific transmission broadband It includes a resonance induction unit (40a) (40b) forming an optical resonator to selectively oscillate light, and a control signal unit (50) for varying the transmission broadband variable unit (30) and the resonance optical frequency variable unit (20), respectively. .

Here, by the control signal unit 50, the selection of the transmission optical frequency band and the selection of the resonant optical frequency are doubled, so that the optical frequency of the laser light oscillating from the optical resonator is scanned over time.

And the condition that the specific transmission broadband width selected to pass the light in the transmission broadband variable part 30 is narrower than the optical frequency range of the light gain part 10, and the resonant optical frequency variable part 20 By simultaneously satisfying the condition of a wider bandwidth than the optical frequency variable range, the coherence of the laser light is increased due to the light gain limitation effect by the transmission broadband selection, but the resonance optical frequency variable range is still maintained without decreasing.

In addition, the resonance induction units 40a and 40b may be arranged by an additional optical element such as an optical fiber coupler or a spatial beam splitter so that the optical resonator structure forms a ring structure.

In addition, the resonance induction units 40a and 40b may be arranged by an additional optical element such as an optical fiber coupler or a partial reflection mirror so that the optical resonator structure has a linear structure.

In addition, the optical resonator may be a rare earth-doped fiber amplifier, a stimulated Raman fiber amplifier, or a semiconductor optical amplifier.

In addition, the resonant optical frequency variable unit 20 may be an electro-optic phase modulator, an electro-optic refractive index changer, or a liquid crystal retarder.

And the transmission broadband variable part 30 is an oscillation optical frequency, characterized in that the acousto-optic tunable filter or Fabry-Perot tunable filter

In addition, the transmission broadband variable part 30 is a diffraction grating part that disperses at different angles according to the optical frequency of the incident light, and the light transmitted from the diffraction grating part is reflected at an arbitrary angle to feed back only a specific optical frequency. It may include an angle scan reflector.

The spectral configuration of the oscillation optical frequency scanning laser light source device based on the double variable according to the present invention will be described as follows.

2A to 2C are spectral configuration diagrams of a double variable-based oscillation optical frequency scanning laser light source device according to the present invention.

FIG. 2A shows the light gain spectrum of the light gain unit 10, which spans a wide optical frequency range to generate light in a corresponding region and simultaneously amplify it.

2B shows the light transmission ratio spectrum of the transmission broadband variable part 30, the transmission broadband variable part 30 selects and transmits only a specific band from the optical frequency range of the light gain part 10, and the transmission broadband width is It has a characteristic narrower than the optical frequency range of the light gain unit 10.

FIG. 2C shows the resonant optical frequency spectrum of the optical resonator formed by the resonant induction parts 40a and 40b, and oscillation is allowed only at the resonant optical frequency order inversely proportional to an integer multiple of the length of the optical resonator.

3A and 3B are graphs of variable characteristics of an optical frequency band selectively oscillated by a transmission broadband variable unit.

3A shows the optical frequency output selective oscillation, and FIG. 3B shows the variable frequency band selectively oscillated by the transmission wideband variable unit 30.

(D) The optical frequency to be selectively oscillated is determined by the resonant optical frequency spectrum of the (A) light gain section, (B) the transmission broadband variable section, and (C) the optical resonance section.

The transmission broadband selected by the transmission broadband variable part 30 includes at least one resonant optical frequency order.

When the transmission broadband variable part 30 operates, the optical frequency band is changed, that is, it means a change of the selected resonant optical frequency order. Accordingly, it is possible to change the optical frequency band of the laser to be selectively oscillated through the variable transmission broadband.

4A and 4B are graphs of variable characteristics of an optical frequency band selectively oscillated by a resonant optical frequency variable unit.

FIG. 4A shows the optical frequency output selective oscillation, and FIG. 4B shows the variable frequency band selectively oscillated by the resonant optical frequency variable unit 20.

When the resonant optical frequency variable part 20 is operated, the length of the optical resonator changes.

Due to the change in the length of the optical resonator, the resonant optical frequency spectrum changes, which means that the optical frequency of the same resonant optical frequency order itself varies.

As the optical frequency of the resonant optical frequency order varies, the optical frequency to be selectively oscillated changes. Accordingly, it is possible to change the optical frequency of the laser to be selectively oscillated through the variable resonance optical frequency.

The resonant optical frequency variable part 20 varies the resonant optical frequency of a specific order oscillated from the light source by varying the length of the optical path of the optical resonator to change the mutual mode interval of the multiple-order end mode spectrum of the light source.

The transmission broadband variable part 30 is more than the variable range of the resonant optical frequency oscillated from the light source by varying the light transmission and light loss spectrum bands to select a specific order end mode band from among the multiple order end mode spectrums of the light source. It varies the oscillation optical frequency of a specific resonant optical frequency in a wide range of precision.

5A to 5C are graphs showing the sequential variable principle.

5A shows that the transmission broadband variable part 30 induces only a change in the resonant optical frequency order when a single operation is performed.

5B shows that the resonant optical frequency spectrum change is induced when the resonant optical frequency variable part 20 is operated in a single operation, and the optical frequency itself having the same resonant optical frequency order changes, and thus, the optical frequency variable occurs continuously.

5C shows that when the transmission broadband variable unit 30 and the resonant optical frequency variable unit 20 are sequentially operated, the resonant optical frequency order change and the optical frequency spectrum change alternately occur. Therefore, it is possible to scan the optical frequency while changing the optical frequency mode.

6A to 6C are graphs showing the continuous variable principle.

6A shows that the transmission band can be continuously changed by using the transmission broadband variable part 30.

6B shows that the resonant optical frequency spectrum change is induced during a single operation of the resonant optical frequency variable unit 20, and the optical frequency itself having the same resonant optical frequency order changes, and thus, the optical frequency variable occurs continuously. .

6C illustrates that when the transmission broadband variable part 30 and the resonant optical frequency variable part 20 are simultaneously operated, the resonant optical frequency order change and the optical frequency spectrum change occur simultaneously.

Therefore, it is possible to scan the optical frequency while changing the resonant optical frequency order.

7 is a graph of sequentially variable characteristics.

The time required for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range and the time required for the transmission broadband width to select and vary the resonant optical frequency order by the transmitting broadband variable part in discontinuous periodicity are periodic As it occurs, it shows that the optical frequency of the laser light oscillating from the optical resonator is sequentially scanned over time.

In the case of sequentially variable, the variation occurs sequentially and alternately, regardless of the difference in size between ΔT and Δt. That is, the selection of the resonant optical frequency order is varied by the transmission broadband variable unit 30, and subsequently, the resonant optical frequency is varied by the resonant optical frequency variable unit 20.

Thus, the laser optical frequency is sequentially scanned over time.

8 is a graph of simultaneous variable characteristics.

As the time required for continuously varying the center optical frequency of the transmission broadband including the resonant optical frequency order is longer than the required time for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range, the transmission broadband The optical frequency range in which the resonant optical frequency order is variable is included in the continuously variable optical frequency range, and the optical frequency of the laser light oscillated from the optical resonator is sequentially scanned over time.

In the case of simultaneous variable, the resonant optical frequency order selection and the resonant optical frequency vary simultaneously.

At this time, as the resonant optical frequency order selection variable (ΔT) is longer than the time at which the resonant optical frequency variable occurs (Δt), the variable range of the resonant optical frequency of a specific order must always be included in the transmission broadband where the variable range of the resonant optical frequency is continuously variable.

Thus, the laser optical frequency is sequentially scanned over time.

9 to 12 are configuration diagrams of a measuring apparatus using a light source device according to the present invention.

9 shows an example of an imaging apparatus using the light source device according to the present invention, in which the selection of the wideband by the transmission wideband variable part 30 and the variable frequency selection by the resonant optical frequency variable part 20 are double The oscillation optical frequency scanning laser light source unit 91 and the oscillation optical frequency scanning laser light source unit 91 in which the optical frequency of the oscillating laser light is sequentially scanned and some light transmitted from the oscillation optical frequency scanning laser light source unit 91 are A channel scan unit 92 for causing other channel variations, a diagnosis reflector 94 in which a diagnosis object is located so that light is transmitted from the channel scan unit 92 and reflected from the subject to be diagnosed, and the diagnosis reflector An optical interferometer unit 93 for inducing an optical interference signal by interfering with the remaining light transmitted from the oscillation optical frequency scanning laser light source unit 91 and the light reflected back from 94, and the optical interferometer It includes an optical measuring unit 95 for acquiring information on a diagnosis target according to the variable frequency selection oscillation from the optical interference signal transmitted from the unit 93.

FIG. 10 shows an example of an optical measurement device application (LiDAR) using the light source device according to the present invention, wherein the selection of the broadband by the transmission broadband variable part 30 and the optical frequency by the resonant optical frequency variable part 20 are shown. The oscillation optical frequency scanning laser light source unit 101 in which the optical frequency of the oscillating laser light is sequentially scanned as the selection variable occurs double, and the diffraction reflection according to the selection of the optical frequency band by the resonant optical frequency variable unit 20 A channel scan unit 102 that scans light for each angle in a non-mechanical manner so as to proceed through the space by being divided at different angles according to the diffuse reflection, and the light is transmitted to the free space and reflected from the object to be diagnosed into the free space. In the optical interference signal according to the optical frequency selection oscillation variable by the diagnostic reflector 103 where the diagnosis object is located at a distance, the optical interferometer unit 104 for inducing an optical interference signal, and the resonant optical frequency variable unit 20 It includes an optical measuring unit 105 that scans and measures spatial information such as distance, shape, distance, speed, or vibration of a diagnosis target corresponding to channels for different angles over time.

FIG. 11 shows an example of an optical measuring device (WDL, OFDR, fiber optic) using a light source device according to the present invention, in which the selection of the broadband by the transmission broadband variable part 30 and the resonance optical frequency variable part 20 According to the selection of the optical frequency band by the oscillation optical frequency scanning laser light source unit 111 in which the optical frequency of the oscillating laser light is sequentially scanned as the optical frequency selection variable by the double occurs, and the resonant optical frequency variable unit 20 A channel scanning unit 112 that transmits and acquires multi-channel information by dividing the light of different optical frequencies according to the optical frequency channel division and proceeds to the optical fiber, and the light is transmitted to the optical fiber and reflected from the object to be diagnosed to the optical fiber. In the optical interference signal according to the optical frequency selection oscillation variable by the diagnostic reflector 113 in which the diagnosis object is located, the optical interferometer part 114 for inducing the optical interference signal, and the resonant optical frequency variable part 20 Accordingly, it includes an optical measuring unit 115 that scans and measures optical fiber information such as distance, pressure, temperature, tension, or vibration of a diagnosis object corresponding to channels for different optical frequencies.

12 shows another example of an optical measuring device using the light source device according to the present invention, in which the selection of the broadband by the transmission broadband variable part 30 and the variable of the optical frequency selection by the resonant optical frequency variable occur double. The oscillation optical frequency scanning laser light source unit 121 in which the optical frequency of the oscillating laser light is sequentially scanned, and the light transmitted from the oscillation optical frequency scanning laser light source unit 121 vary different channels according to the selection of a specific transmission broadband. A channel scan unit 122 for generating a signal, a diagnosis reflector 123 in which a diagnosis target is located so that light is transmitted from the channel scan unit 122 and reflected from the target to be diagnosed, and the diagnosis reflector 123 A photodetector 124 that converts a change in intensity of light reflected from and transmitted back into an electrical signal by time, and spectrum information of light for each optical frequency of a diagnosis target from the change of the electrical signal by time transmitted from the photodetector 124. It includes a light measuring unit 125 to be acquired.

The dual variable-based oscillation optical frequency scanning laser light source and the measuring device using the same according to the present invention described above include the variable selection of the transmission optical frequency band and the variable selection of the resonance optical frequency, so that the light of the laser light oscillating from the optical resonator occurs. It is possible to actively change the output characteristics by scanning the frequency over time.

As described above, it will be understood that the present invention is implemented in a modified form without departing from the essential characteristics of the present invention.

Therefore, the specified embodiments should be considered from a descriptive point of view rather than a limiting point of view, and the scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto are included in the present invention. It will have to be interpreted.

10. Light gain section
20. Resonant optical frequency variable part
30. Transmitted broadband variable part
40a.40b. Resonance induction part
50. Control signal section

Claims (17)

A light gain unit for generating and amplifying light;
A transmission broadband variable unit that selects a specific optical frequency band from the light generated from the light gain unit and varies the light to transmit;
A resonant optical frequency variable unit for varying multiple resonant optical frequency orders within the specific optical frequency band over a variable range narrower than an interval between the respective orders;
A resonance induction unit configured to form an optical resonance unit to selectively oscillate light having a specific resonance optical frequency within a specific transmission broadband, including the light gain unit, the transmission broadband variable unit, and the resonance optical frequency variable unit;
And a control signal unit for varying the transmission broadband variable unit and the resonance optical frequency variable unit, respectively. The method of claim 1, wherein the selection of the transmission optical frequency band and the selection of the resonance optical frequency are doubled by the control signal unit, so that the optical frequency of the laser light oscillating from the optical resonator is scanned over time. Dual variable-based oscillation optical frequency scanning laser light source device. The method of claim 1, wherein a specific transmission broadband width selected so that light passes through the transmission broadband variable part,
The condition that the bandwidth is narrower than the optical frequency range of the optical gain unit and the condition that the bandwidth is wider than the optical frequency variable range of the resonant optical frequency variable portion are simultaneously satisfied,
A double variable-based oscillation optical frequency scanning laser light source device, characterized in that while the coherence of the laser light is increased by the light gain limitation effect by the transmission broadband selection, the resonance optical frequency variable range is still maintained without decreasing. The method of claim 1, wherein the time required for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range, and
The time required for the transmission broadband width to select and vary the resonant optical frequency order by the transmission broadband variable part discontinuously periodically,
A double variable-based oscillation optical frequency scanning laser light source device, characterized in that the optical frequencies of laser light oscillating from the optical resonator are sequentially scanned according to time as they intersect each other and periodically occur. The method of claim 1, wherein than the required time for varying the resonant optical frequency of a specific order to be selectively oscillated over a variable range,
As the time required for continuously varying the central optical frequency of the transmission broadband including the resonant optical frequency order becomes longer,
The optical frequency range of the laser light oscillating from the optical resonator is sequentially scanned according to time by including the optical frequency range in which the resonant optical frequency order is variable within the optical frequency range in which the transmission broadband is continuously variable. Dual variable-based oscillation optical frequency scanning laser light source device. The method of claim 1 or 2, wherein the resonant optical frequency variable part,
Double variable-based oscillation optical frequency scanning, characterized in that the resonant optical frequency of a specific order oscillated from the light source is varied by varying the length of the optical path of the optical resonator to change the mutual mode spacing of the multiple-order end-mode spectrum of the light source. Laser light source device. The method of claim 1 or 2, wherein the transmission broadband variable part,
By varying the light transmission and light loss spectrum bands and selecting a specific order end mode band among the various order end mode spectrums of the light source, the range of the specific resonance optical frequency in a wider range than the variable range of the resonance optical frequency oscillated from the light source. A double variable-based oscillation optical frequency scanning laser light source device, characterized in that the oscillation optical frequency is varied. The method of claim 1, wherein the resonance inducing unit,
A dual variable-based oscillation optical frequency scanning laser light source device, characterized in that a resonance induction part is disposed by an optical element added by an optical fiber coupler or a spatial beam splitter so that the optical resonator structure forms an annular structure. The method of claim 1, wherein the resonance inducing unit,
A dual variable-based oscillation optical frequency scanning laser light source device, characterized in that a resonance induction part is arranged by an optical element added by an optical fiber coupler or a partial reflection mirror so that the optical resonator structure forms a linear structure. The method of claim 1, wherein the optical resonance unit,
Rare earth-doped fiber amplifier (rare earth-doped fiber amplifier), a stimulated Raman fiber amplifier (stimulated Raman fiber amplifier) or a semiconductor optical amplifier (semiconductor optical amplifier), characterized in that the double variable-based oscillation optical frequency scanning laser light source device. The method of claim 1, wherein the resonant optical frequency variable part,
An oscillation optical frequency scanning laser light source device based on a double variable, characterized in that it is an electro-optic phase modulator, an electro-optic refractive index changer, or a liquid crystal retarder. The method of claim 1, wherein the transmission broadband variable part,
An acousto-optic tunable filter or a Fabry-Perot tunable filter. A dual tunable-based oscillation optical frequency scanning laser light source device, characterized in that it is an acousto-optic tunable filter or a Fabry-Perot tunable filter. The method of claim 1, wherein the transmission broadband variable part,
A diffraction grating unit that disperses at different angles according to the optical frequency of the incident light,
The dual variable-based oscillation optical frequency scanning laser light source device, characterized in that the light transmitted from the diffraction grating unit is reflected at an arbitrary angle, and thus an angle scan reflector that feeds back only a specific optical frequency. An oscillation optical frequency scanning laser light source for sequentially scanning an optical frequency of the oscillating laser light as the selection of the broadband by the transmission broadband variable part and the optical frequency selection by the resonant optical frequency variable occur double;
A channel scan unit that causes different channels to be varied according to selection of a specific transmission broadband in which some light transmitted from the oscillation optical frequency scanning laser light source unit is varied;
A diagnosis reflector in which a diagnosis object is positioned so that light is transmitted from the channel scan unit and reflected from an object to be diagnosed;
An optical interferometer unit configured to induce an optical interference signal by interfering with the remaining light transmitted from the oscillation optical frequency scanning laser light source unit by the light reflected from the diagnostic reflection unit and transmitted back;
A measurement device using a dual variable-based oscillation optical frequency scanning laser light source, comprising: an optical measuring unit for acquiring information on a diagnosis object according to an optical frequency selective oscillation variable from the optical interference signal transmitted from the optical interferometer. . An oscillation optical frequency scanning laser light source for sequentially scanning an optical frequency of the oscillating laser light as the selection of the broadband by the transmission broadband variable part and the optical frequency selection by the resonant optical frequency variable occur double;
A channel scanning unit for performing optical scan for each angle in a non-mechanical manner so as to proceed through space by diffractive reflection or dispersion reflection according to the selection of the optical frequency band by the resonant optical frequency variable;
A diagnostic reflector in which the diagnostic object is located at a distance so that light is transmitted to the free space and reflected from the object to be diagnosed to the free space;
An optical interferometer for inducing an optical interference signal;
It characterized in that it comprises a; optical frequency selection by the resonant optical frequency variable unit, an optical measuring unit for scanning and measuring spatial information of the diagnosis object corresponding to the channel for each angle different from the optical interference signal according to the oscillation variable according to time; Measurement device using a double variable-based oscillating optical frequency scanning laser light source. An oscillation optical frequency scanning laser light source for sequentially scanning an optical frequency of the oscillating laser light as the selection of the broadband by the transmission broadband variable part and the optical frequency selection by the resonant optical frequency variable occur double;
A channel scanning unit for transmitting and acquiring multi-channel information by dividing light of different optical frequencies according to the optical frequency channel division according to the selection of the optical frequency band by the resonant optical frequency variable unit and proceeding to the optical fiber;
A diagnostic reflector in which a diagnostic object is positioned so that light is transmitted to the optical fiber and reflected from the object to be diagnosed to the optical fiber;
An optical interferometer for inducing an optical interference signal;
Characterized in that it comprises a; optical frequency selection by the resonant optical frequency variable unit, an optical measuring unit for scanning and measuring optical fiber information of a diagnosis object corresponding to a channel for each optical frequency different from each other over time in the optical interference signal according to the oscillation variable. Measurement device using a double variable-based oscillation optical frequency scanning laser light source. An oscillation optical frequency scanning laser light source for sequentially scanning an optical frequency of the oscillating laser light as the selection of the broadband by the transmission broadband variable part and the optical frequency selection by the resonant optical frequency variable occur double;
A channel scan unit for causing different channels to be varied according to selection of a specific transmission broadband in which light transmitted from the oscillation optical frequency scanning laser light source unit is varied;
A diagnosis reflector in which a diagnosis object is positioned so that light is transmitted from the channel scan unit and reflected from an object to be diagnosed;
A light detector configured to convert a change in intensity of light reflected from the diagnostic reflector and transmitted back into an electric signal over time;
And an optical measuring unit that acquires spectral information of light for each optical frequency of the object to be diagnosed from the change of the electrical signal for each time transmitted from the optical detection unit. 2. A measuring apparatus using a double variable-based oscillation optical frequency scanning laser light source.

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