KR20140074788A - Apparatus and Method for emitting light - Google Patents

Abstract

A method and an apparatus for outputting light control a current which is applied in two or more laser diodes; generate pulse light each having different wavelengths in which an intensity, a width, and a repetition rate are controlled according to the current which is applied in the laser diodes; amplify multi-wavelength light which is combined with the pulse light which are generated in the laser diodes; and output light which is obtained as a result of the pumping of a nonlinear gain medium by multi-wavelength light which is amplified based on wavelength conversion features of the nonlinear gain medium in optical fiber which includes the nonlinear gain medium in which the wavelength conversion features are changed by the amplified multi-wavelength light.

Description

A method of outputting light and an optical output device. {Apparatus and Method for emitting light}

A method for outputting light, and an optical output apparatus.

Utilizing the properties of light with monochromaticity, coherence, and directionality, light is currently being utilized in various fields. In the biotechnology and medical fields, light is being utilized in a variety of ways such as observation of tissues and cells, diagnosis of diseases, or laser procedures.

Especially in the medical field, since the internal structure of the human body can be observed without directly cutting the human body with the light characteristics as described above, the cause, position and progress of various diseases can be easily and safely detected by using light. In addition to the development of technologies for generating light such as high power, continuous wave, and wavelength sweeping, the depth of light transmission is improved and tomographic images of living tissue or cells can be acquired in high resolution in real time have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of outputting light and an optical output device. The present invention also provides a computer-readable recording medium on which a program for causing the computer to execute the method is provided. The method of outputting light and the technical object to be achieved by the optical output device are not limited to the above-described technical problems, and other technical problems may exist.

An optical output apparatus according to an aspect of the present invention includes: a first laser diode for generating pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled according to an applied current; A second laser diode for generating pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled according to the applied current; A laser diode control unit for controlling a current applied to the first laser diode and the second laser diode; An amplifying unit for amplifying multi-wavelength light in which the first pulse light and the second pulse light are combined; And a nonlinear gain medium in which a wavelength conversion characteristic is changed by the incident light, wherein the wavelength conversion characteristic of the nonlinear gain medium is changed based on the wavelength conversion characteristic of the nonlinear gain medium changed by the multi- And an optical fiber for outputting light obtained as a result of pumping of the optical fiber.

According to another aspect of the present invention, there is provided a method of outputting light in an optical output apparatus including at least two laser diodes, comprising: controlling a current applied to the at least two laser diodes; Generating pulse lights having different wavelengths whose intensity, width, and repetition rate are controlled in accordance with the currents applied to the at least two laser diodes; Amplifying multi-wavelength light in which pulse lights generated from the at least two laser diodes are combined; Linear gain medium, the wavelength conversion characteristic of the nonlinear gain medium being changed by the amplified multi-wavelength light in an optical fiber including a nonlinear gain medium whose wavelength conversion characteristic is changed by the incident light, And outputting the output signal.

An optical coherent tomography apparatus for photographing a single layer by irradiating light on a target according to another aspect of the present invention includes a first laser diode and a second laser diode for controlling a current applied to the first laser diode, A second pulse of a second wavelength having a controlled intensity, a width, and a repetition rate according to a current applied to the second laser diode, A nonlinear gain medium including a nonlinear gain medium which emits a pulse light and amplifies the multiwavelength light in which the first pulse light and the second pulse light are combined and whose wavelength conversion characteristic changes according to the amplified multiwavelength light, An optical output device for outputting light obtained as a result of pumping of the nonlinear gain medium by the amplified multi-wavelength light based on a wavelength conversion characteristic of the gain medium; An interferometer for separating the output light into measurement light and reference light, irradiating the measurement light to the object, and receiving the response light reflected from the object; A detector for detecting an interference signal generated by the response light and the reference light; And a video signal processor for generating a tomographic image of the object using the detected interference signal.

According to still another aspect of the present invention, there is provided a computer-readable recording medium having recorded thereon a program for causing a computer to execute a method of outputting light.

According to the above, optical pumping is performed by using multi-wavelength light combined with pulse light generated in the laser diodes, and intensity, width, repetition rate, and the like of each pulse light in the optical output device outputting the obtained light The spectrum of the light output from the optical output device can be shaped into a desired shape by controlling at least one of the polarized light and the polarized light.

The optical output device outputs light having an extended bandwidth in a predetermined wavelength range by controlling at least one of the intensity, the width, the repetition rate, and the polarization of each of the pulse lights generated in the laser diodes can do.

By controlling at least one of the intensity, the width, the repetition rate, and the polarization of each of the pulse light beams generated in the laser diodes, the optical output device can generate light having any type of optical spectrum including a Gaussian shape in a predetermined wavelength region Can be output.

1 is a block diagram illustrating an optical output apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating an optical output apparatus according to another embodiment of the present invention.
3 is a view illustrating an optical output apparatus according to an embodiment of the present invention.
4 is a view illustrating an optical output apparatus according to another embodiment of the present invention.
5 is a view illustrating an optical output apparatus according to another embodiment of the present invention.
FIG. 6 is a graph showing a change in optical spectrum of the light output from the optical output device under the control of the laser diode control unit shown in FIG. 1;
FIG. 7 is a diagram illustrating an optical coherence tomography apparatus including the optical output apparatus shown in FIG. 1 according to an embodiment of the present invention. Referring to FIG.
8 is a flowchart illustrating a method of outputting light by an optical output apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a block diagram illustrating an optical output apparatus according to an embodiment of the present invention. Referring to FIG. 1, an optical output apparatus 100 includes a first laser diode 110, a second laser diode 120, a laser diode control unit 130, an amplification unit 140, and an optical fiber 150.

The optical output apparatus 100 shown in Fig. 1 is only shown in the components related to the present embodiment in order to prevent the characteristics of the present embodiment from being blurred. Therefore, it will be understood by those skilled in the art that other general-purpose components other than the components shown in FIG. 1 may be further included.

The first laser diode 110 generates a first pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled according to the applied current. The first laser diode 110 is a semiconductor device that induces and emits light generated by an applied current and can generate pulse lights of various wavelengths according to the structure of the semiconductor material constituting the first laser diode 110 . Accordingly, the optical output apparatus 100 includes a laser diode that emits pulsed light of a first wavelength according to a spectrum of light to be output by using the optical output apparatus 100 among laser diodes that generate pulse lights of various wavelengths, 1 laser diode (110).

The second laser diode 120 generates second pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled in accordance with the applied current. When the second laser diode 120 applies a current to the second laser diode 120 as in the case of the first laser diode 110, Of pulsed light. At this time, the second wavelength may be a wavelength different from the first wavelength.

Accordingly, the optical output apparatus 100 includes a laser diode that emits pulse light of a first wavelength based on a spectrum of light to be output using the optical output apparatus 100, and a laser diode that emits pulse light of a second wavelength May be used as the first laser diode 110 and the second laser diode 120, respectively. For example, in order to output light having a flat optical spectrum in the 1300 nm band, the optical output apparatus 100 may include a laser diode 110 for generating pulse light having a wavelength of 1060 nm by the first laser diode 110, And a laser diode that generates pulsed light having a wavelength of 1080 nm by the second laser diode 120 can be used. However, the numerical values of the present embodiment are merely examples. The optical output apparatus 100 includes a first laser diode 110 and a second laser diode 120 for outputting pulse lights having different wavelengths in order to output light having a flat optical spectrum in the 1300 nm band Can be used.

The laser diode control unit 130 controls currents applied to the first laser diode 110 and the second laser diode 120. The laser diode control unit 130 determines the intensity, width, and repetition rate of each of the first pulse light and the second pulse light output from the first laser diode 110 and the second laser diode 120, To the first laser diode (110) and the second laser diode (120). At this time, the wavelength bandwidth of the pulse light can be represented by a full width at half maximum (FWHM).

Accordingly, the laser diode control unit 130 controls the first laser diode 110 and the second laser diode 120, respectively, so that the signals output from the first laser diode 110 and the second laser diode 120, It is possible to control so that the pulse lights having different wavelengths have different optical spectrums.

For example, in order for the optical output apparatus 100 to output light having a flat optical spectrum in the 1300 nm band, the laser diode control unit 130 controls the first laser diode 110 and the second laser diode The first pulse light having a wavelength of 1060 nm outputted from the first laser diode 110 is applied to the second laser diode 120 at a repetition rate of 20 kHz and the second pulse light having a wavelength of 1080 nm outputted from the second laser diode 120 Can be controlled to be generated at a repetition rate of 500 kHz. However, the numerical values of the present embodiment are merely examples. In order to output light having a flat optical spectrum in the 1300 nm band from the optical output apparatus 100, the laser diode control unit 130 controls the first pulse light of the first wavelength and the second pulse of the second wavelength Light can be controlled in various ways.

According to one embodiment, the laser diode control unit 130 controls at least one of the intensity, the width, and the repetition rate of each of the first pulse light and the second pulse light in order to shape the spectrum of the light output from the optical fiber 150 can do.

According to another embodiment, the laser diode control unit 140 controls the laser diode control unit 140 such that the light output from the optical fiber 150 has a Gaussian shape optical spectrum in a third wavelength range, At least one of the intensity, the width, and the repetition rate of each of the lights can be controlled.

According to another embodiment, the laser diode control unit 140 controls the intensity of each of the first pulse light and the second pulse light so that the light output from the optical fiber 150 has a flat optical spectrum in the third wavelength range, , The width, and the repetition rate.

The laser diode control unit 130 according to embodiments may correspond to at least one processor or may include at least one processor. In addition, the controller 140 may be located inside the optical output apparatus 100 as shown in FIG. 1, but may be located outside the optical output apparatus 100.

The amplifying unit 140 amplifies the multi-wavelength light in which the first pulse light generated in the first laser diode 110 and the second pulse light generated in the second laser diode 120 are combined. At this time, the amplifying unit 140 may combine the first pulse light and the second pulse light by an optical coupler or a WDM (Wavelength Division Multiplexing) technique, but the present invention is not limited thereto.

The amplification unit 140 amplifies the total intensity of the multi-wavelength light in which the first pulse light and the second pulse light are combined. The optical elements used in the amplification unit 140 are amplified by the amplification unit 140 based on the first wavelength of the first pulse light and the second wavelength of the second pulse light so that the amplification unit 140 can amplify the intensity of the multiwavelength light in the wavelength band of the multi- Can be determined.

The amplification unit 140 may be implemented in various ways using optical elements such as a laser diode, an optical fiber, or an optical isolator. Specific embodiments related to this refer to the drawings of Fig. However, the amplifier 140 of FIG. 1 is not limited to the embodiment shown in FIG.

For example, in order for the optical output apparatus 100 to amplify multi-wavelength light in which first pulse light having a wavelength of 1060 nm and second pulse light having a wavelength of 1080 nm are combined, the amplifying unit 140 emits light of 976 nm And a Ytterbium doped fiber (YDF) in which light has a wavelength of 976 nm is used to amplify multi-wavelength light. However, the numerical values of the present embodiment are merely examples. In order to amplify the multi-wavelength light in which the amplifying unit 140 combines the first pulse light having the wavelength of 1060 nm and the second pulse light having the wavelength of the 1080 nm, the amplifying unit 140 includes a laser diode An optical fiber including a gain medium having different characteristics can be used.

The optical fiber 150 includes a nonlinear gain medium whose wavelength conversion characteristics vary according to the multiwavelength light input from the amplification unit 140. The optical fiber 150 has a wavelength band wider than the spectrum of the multiwavelength light input according to the wavelength conversion characteristic of the non- As shown in Fig. In this case, the multi-wavelength light amplified by the amplification unit 140 acts as a pumping light source, and the optical fiber 150 outputs light having a wavelength band modified according to the changed wavelength conversion characteristic of the nonlinear gain medium.

At this time, the nonlinear gain medium of the optical fiber 150 has a characteristic in which the wavelength conversion characteristic changes depending on the input pumping light source. The wavelength conversion characteristics exhibit characteristics that vary with the wavelength, intensity, and polarization of the incident light when the light is transmitted through the optical fiber 150. The optical fiber 150 includes a nonlinear gain medium having a characteristic in which a wavelength conversion characteristic is changed according to characteristics of an input pumping light source, unlike an optical fiber used for amplifying multi-wavelength light in the amplification unit 140. For example, the optical fiber 150 may include, but is not limited to, an optical fiber in which stimulated Raman scattering occurs due to optical pumping. Accordingly, the nonlinear gain medium of the optical fiber 150 changes the wavelength conversion characteristic according to the inputted multi-wavelength light, and the spectrum of the light obtained from the optical fiber 150 changes according to the wavelength conversion characteristic of the nonlinear gain medium.

Accordingly, the optical output apparatus 100 controls the intensity, width, and repetition rate of each of the first pulse light and the second pulse light to change the spectrum of the multi-wavelength light input to the optical fiber 150, Can output light of a spectrum that is modified to a desired shape.

The wavelength conversion characteristics of the nonlinear gain medium of the optical fiber 150 may vary depending on the kind and composition ratio of the materials included in the nonlinear gain medium and the geometry and length of the optical fiber 150. Accordingly, the optical output apparatus 100 can determine the type and the composition ratio of the materials included in the nonlinear gain medium of the optical fiber 150, the type and the composition ratio of the optical fiber 150 based on the spectrum of the light to be output using the optical output apparatus 100, You can change the geometry and length.

For example, in order for the optical output apparatus 100 to output light having a flat optical spectrum in the 1300 nm band, the optical output apparatus 100 may be configured such that the first pulse light having a wavelength of 1060 nm and the first pulse light having a wavelength of 1080 nm A high-birefringent fiber (Hi-Bi fiber) can be used as the optical fiber 150 for multi-wavelength light amplified by coupling the second pulse light. However, the present invention is not limited thereto, and the optical output apparatus 100 may be configured to have a flat shape in the 1300 nm band by using the multi-wavelength light amplified by combining the first pulse light having the wavelength of 1060 nm and the second pulse light having the wavelength of the 1080 nm. The optical output device 100 can use another type of optical fiber as the optical fiber 150 or adjust the length of the optical fiber.

According to one embodiment, the optical output device 100 can use a high non-linear fiber (HNLF) as the optical fiber 150. Accordingly, the optical output apparatus 100 can enhance the Raman frequency conversion effect using the stimulated Raman scattering (Stimulated Raman Scattering).

According to another embodiment, the optical output device 100 may use a high-birefringent fiber (Hi-Bi fiber) as the optical fiber 150. [ Accordingly, the optical output apparatus 100 can enhance the polarization dependence characteristic and the polarization maintaining effect.

Alternatively, the optical output apparatus 100 may be configured such that the materials included in the nonlinear gain medium of the high nonlinear optical fiber (HNLF) and the high birefringent optical fiber (Hi-Bi fiber) The nonlinear gain medium including the nonlinear gain medium can be used as the nonlinear gain medium of the optical fiber 150. [

According to an embodiment, the optical output apparatus 100 may include at least one laser (not shown) for generating pulse light whose intensity, width, and repetition rate are controlled in accordance with the current applied to the first laser diode 110 and the second laser diode 120, Diode. ≪ / RTI > The laser diode control unit 130 controls currents applied to the first laser diode 110, the second laser diode 120, and at least one or more laser diodes. The amplification unit 140 amplifies the multi-wavelength light in which the first pulse light, the second pulse light, and the pulse light generated from the at least one laser diode are combined. Accordingly, the optical fiber 150 can output light of a spectrum having a wider wavelength band than the spectrum of the multi-wavelength light input from the amplification unit 140 according to the wavelength conversion characteristics of the nonlinear gain medium.

According to another embodiment, the optical output apparatus 100 may include at least one polarization controller (not shown) for controlling at least one of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi- . Accordingly, the optical output apparatus 100 may control at least one of the intensity, the width, and the repetition rate of the first pulse light and the second pulse light, or may control at least one of the first pulse light and the second pulse light using at least one polarization controller (not shown) The spectrum of the light output from the optical fiber 150 can be shaped by controlling any one of the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light. Reference is made to Figs. 2 and 4 for a specific description of the polarization controller (not shown).

2 is a block diagram illustrating an optical output apparatus according to another embodiment of the present invention. 2, the optical output apparatus 100 includes a first laser diode 110, a second laser diode 120, a laser diode control unit 130, an amplification unit 140, an optical fiber 150, A second polarization controller 162, and a third polarization controller 163. The first laser diode 110, the second laser diode 120, the laser diode control unit 130, the amplification unit 140 and the optical fiber 150 shown in FIG. 2 correspond to the first laser diode 110 The second laser diode 120, the laser diode control unit 130, the amplification unit 140, and the optical fiber 150, as shown in FIG. 1, the contents described in relation to the first laser diode 110, the second laser diode 120, the laser diode control unit 130, the amplification unit 140, and the optical fiber 150 are the same as those The second laser diode 120, the laser diode control unit 130, the amplification unit 140 and the optical fiber 150 according to the first embodiment of the present invention.

The laser diode control unit 130 determines the intensity, width, and repetition rate of each of the first pulse light and the second pulse light output from the first laser diode 110 and the second laser diode 120, To the first laser diode (110) and the second laser diode (120).

The first laser diode 110 generates a first pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled according to the applied current.

The second laser diode 120 generates second pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled in accordance with the applied current.

The first polarization controller 161 controls the polarization of the first pulse light output from the first laser diode 110. Accordingly, the first polarization controller 161 outputs the first pulse light controlled in a predetermined polarization state.

The second polarization controller 162 controls the polarization of the second pulse light output from the second laser diode 120. Accordingly, the second polarization controller 162 outputs the second pulse light controlled to a predetermined polarization state.

The amplifying unit 140 amplifies the multi-wavelength light combined with the first pulse light whose polarization is controlled by the first polarization controller 161 and the second pulse light whose polarization is controlled by the second polarization controller 162 .

The third polarization controller 163 controls the polarization of the multi-wavelength light amplified by the amplification unit 140. Accordingly, the third polarization controller 163 outputs the multi-wavelength light controlled in the predetermined polarization state.

The optical fiber 150 outputs light obtained as a result of the pumping of the nonlinear gain medium based on the wavelength conversion characteristics of the nonlinear gain medium modified by the multiwavelength light whose polarization is controlled by the third polarization controller 163. That is, the multi-wavelength light whose polarization is controlled by the third polarization controller 163 acts as a pumping light source, and the optical fiber 150 outputs the light of which the wavelength band is modified according to the wavelength conversion characteristic of the changed nonlinear gain medium. Accordingly, the optical fiber 150 can output a spectrum of light having a wavelength band that is wider than the spectrum of the multi-wavelength light input from the third polarization controller 163.

The nonlinear gain medium of the optical fiber 150 has a characteristic in which the wavelength conversion characteristic changes depending on the input pumping light source. The wavelength conversion characteristic is a characteristic that changes depending on the wavelength, intensity, and polarization of incident light when the light is transmitted through the optical fiber 150. Thus, the optical output apparatus 100 is configured to output the first pulse light, the second pulse light, the multi-wavelength light, and the amplification by the first polarization controller 161, the second polarization controller 162, and the third polarization controller 163, The wavelength conversion characteristic of the nonlinear gain medium can be changed by controlling at least one polarization of the multi-wavelength light, and the optical output apparatus 100 can output light of a desired type of spectrum based on the changed wavelength conversion characteristic.

The optical output apparatus 100 according to the present embodiment is shown to control the polarization using the first polarization controller 161, the second polarization controller 162, and the third polarization controller 163, but the present invention is not limited thereto . The optical output apparatus 100 according to another embodiment may include only a part of the first polarization controller 161, the second polarization controller 162, and the third polarization controller 163. Alternatively, the optical output apparatus 100 may include at least one polarization controller (not shown) for controlling the polarization state of multi-wavelength light in addition to the first polarization controller 161, the second polarization controller 162, and the third polarization controller 163 .

According to an embodiment, the optical output apparatus 100 may include at least one or more than one laser diode 110 and at least one laser diode 120 that generates pulse light whose intensity, width, And may further include a laser diode. Accordingly, the optical output apparatus 100 includes at least one polarization controller (not shown) for adjusting the polarization state of the pulsed light generated in the at least one laser diode in addition to the first polarization controller 161, the second polarization controller 162, ).

Accordingly, the optical output apparatus 100 can control at least one of the intensity, the width, and the repetition rate of each of the first pulse light, the second pulse light, the pulse light generated in the at least one laser diode, or the first polarization controller 161 By controlling the polarization state of the light through the second polarization controller 162, the third polarization controller 163, or at least one polarization controller (not shown), the optical output apparatus can change the spectrum of the output light to a desired shape ) can do.

3 is a view illustrating an optical output apparatus according to an embodiment of the present invention. 3, the optical output apparatus 100 includes a first laser diode 110, a second laser diode 120, a first laser diode control unit 131, a second laser diode control unit 132, a monitoring port A monitoring port 212, an optical attenuator (VA) 220, an amplification unit 230, and an optical fiber 240. The amplifying unit 230 includes a WDM coupler 231, an isolator 232, a fourth laser diode 233, a TFB (TFB) 234, a YBF 235, an isolator 236, a monitoring port 237, and a WDM coupler 238.

The first laser diode 110 generates a first pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled according to the applied current. The first laser diode 110 may generate pulse lights having various wavelengths according to the structure of the semiconductor material constituting the first laser diode 110.

The second laser diode 120 generates pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled in accordance with the applied current. At this time, the second wavelength may be a wavelength different from the first wavelength.

The optical output apparatus 100 includes a laser diode that emits pulse light of a first wavelength and a laser diode that emits pulse light of a second wavelength based on a spectrum of light to be output using the optical output apparatus 100, 1 laser diode 110 and a second laser diode 120, respectively.

The first laser diode control unit 131 controls the current applied to the first laser diode 110. The laser diode control unit 131 determines the intensity, the width, and the repetition rate of each of the first pulse lights output to the first laser diode 110, and applies the current to the first laser diode 110.

The second laser diode control unit 132 controls the current applied to the second laser diode 120. The laser diode control unit 132 determines the intensity, the width, and the repetition rate of each of the second pulse lights output from the second laser diode 120, and applies the current to the second laser diode 120.

The monitoring port 211 separates a part of the output of the first pulse light output from the first laser diode 110 and outputs a first pulse light whose intensity, width, and repetition rate are controlled by the first laser diode control unit 131 Monitoring.

The monitoring port 212 separates a part of the output of the second pulse light output from the second laser diode 120 and outputs a second pulse light whose intensity, width, and repetition rate are controlled by the second laser diode control unit 132 Monitoring.

The optical attenuator (VA) 220 additionally adjusts the ratio of the output of the first pulse light output from the first laser diode 110 to the output of the second pulse light output from the second laser diode 120 The output magnitude of the first pulse light output from the first laser diode 110 can be attenuated.

The amplifying unit 230 amplifies the multi-wavelength light in which the first pulse light generated in the first laser diode 110 and the second pulse light generated in the second laser diode 120 are combined. According to the present embodiment, the amplifier 230 includes a WDM coupler 231, an isolator 232, a fourth laser diode 233, a TFB (TFB) 234, Wavelength light combining the first pulse light and the second pulse light by using the optical elements of the ytterbium-doped optical fiber (YDF) 235, the isolator 236, the monitoring port 237, and the WDM coupler 238 Can be amplified.

The WDM coupler 231 couples the first pulse light and the second pulse light generated by the first laser diode 110 and the second laser diode 120, respectively.

The isolator 232 prevents the light of the fourth wavelength emitted by the fourth laser diode 233 and the light of the multiple wavelengths inputted to the amplification unit 230 from being reflected and propagating in the opposite direction, And the second laser diode 120 are prevented from being damaged.

The fourth laser diode 233 emits a pump light for pumping the Yb doped optical fiber 235 in amplifying the multi-wavelength light that has flowed into the amplification unit 230.

The optical fiber bundle (TFB) 234 couples the pump light output from the fourth laser diode 233 and the multi-wavelength light input to the amplification unit 230 to be incident on the Y-doped optical fiber 235.

The ytterbium-doped optical fiber (YDF) 235 amplifies the multi-wavelength light input to the amplification unit 230 through the pumping action of the pump light output from the fourth laser diode 233, Increases the output gain in a region of a predetermined wavelength. For convenience of explanation, the optical fiber for amplifying the multi-wavelength light in the predetermined wavelength region in the amplification unit 230 is represented by Y-doped optical fiber (YDF) 235, but the present invention is not limited thereto. The amplification unit 230 may use an erbium doped fiber (EDF) or an optical fiber doped with another material according to the wavelength band of the multi-wavelength light input to the amplification unit 230. Unlike the optical fiber 240, the optical fiber used for amplification in the amplification unit 230 has a characteristic of increasing the output gain according to characteristics of a gain medium pumped in a narrow wavelength band.

The isolator 236 prevents the amplification loss of the amplification unit 230 by blocking the propagation of the multi-wavelength light amplified by the Yb doped optical fiber 235 in the reverse direction.

The monitoring port 237 separates a portion of the output of the multiwavelength light amplified by the Yb doped fiber (YDF) 235 and monitors the amplified multiwavelength light.

The WDM coupler 238 separates the broadband light of the backward component generated in the optical fiber 240 from the forward multiwavelength light to prevent the backward component of the broadband light from being reintroduced into the amplification unit 230.

The optical fiber 240 includes a nonlinear gain medium whose wavelength conversion characteristics vary according to the multiwavelength light input from the amplifying unit 230 and is configured to adjust the nonlinear gain by the input multiwavelength light based on the wavelength conversion characteristic of the non- And outputs light obtained as a result of pumping of the medium. According to this, the multi-wavelength light amplified by the amplifying unit 230 acts as a pumping light source, and the optical fiber 240 outputs the light of which the wavelength band is modified according to the changed wavelength conversion characteristic of the nonlinear gain medium. Also, the optical fiber 240 can output light of a spectrum having a wider wavelength band than the spectrum of the input multi-wavelength light.

Accordingly, the optical output apparatus 100 controls the intensity, width, and repetition rate of each of the first pulse light and the second pulse light to change the spectrum of the multi-wavelength light input to the optical fiber 240, Can output light of a spectrum that is modified to a desired shape.

4 is a view illustrating an optical output apparatus according to another embodiment of the present invention. 4, the optical output apparatus 100 includes a first laser diode 110, a second laser diode 120, a first laser diode control unit 131, a second laser diode control unit 132, a monitoring port 211, a monitoring port 212, a variable attenuator (VA) 220, an amplification unit 230 ', and an optical fiber 240.

The first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode control unit 132, the monitoring port 211, the monitoring port 212, The optical attenuator VA 220 and the optical fiber 240 are connected to the first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode 120, A monitoring port 211, a monitoring port 212, a variable attenuator (VA) 220, and an optical fiber 240. [ 3, the first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode control unit 132, the monitoring port 211, the monitoring port 212, , The optical attenuator (VA) 220, and the optical fiber 240 are also applicable to FIG. 4, so that redundant description will be omitted.

The amplifying unit 230 'amplifies the multi-wavelength light in which the first pulse light generated in the first laser diode 110 and the second pulse light generated in the second laser diode 120 are combined. The amplifier 230 'shown in FIG. 4 includes a WDM coupler 2301, an isolator ISO 2302, a fourth laser diode 2303, a first optical fiber bundle TFB 2304, a first Yb doped optical fiber A first monitoring port 2307, a first WDM coupler 2308, a fifth laser diode 2313, a second optical fiber bundle (TFB) 2314, a second optical fiber bundle (TFB) 2314, (ISO 2316), a second monitoring port 2317, and a second WDM coupler 2318. The first and second WDM couplers 2318,

The amplification unit 230 'shown in FIG. 4 amplifies the multi-wavelength light in which the first pulse light and the second pulse light are combined, in two stages, as compared with the amplification unit 230 shown in FIG. That is, the first stage amplification is performed using the fourth laser diode 2303, the first optical fiber bundles TFB and 2304 and the first Yb doped optical fiber (YDF) 2305, and the fifth laser diode 2313, The second optical fiber bundle (TFB) 2314, and the second Yb doped fiber (YDF) 2315 to perform amplification in the second step. In this embodiment, the multi-wavelength light is amplified in two stages. However, the present invention is not limited thereto, and the optical output apparatus 100 according to another embodiment may amplify multi-wavelength light in three stages and four stages .

The WDM coupler 2301 couples the first pulse light and the second pulse light generated by the first laser diode 110 and the second laser diode 120, respectively.

The isolator 2302 shields the light of the fourth wavelength emitted by the fourth laser diode 2303 and the multi-wavelength light input to the amplification unit 230 'from being propagated in the reverse direction.

The fourth laser diode 2303 emits pump light for pumping the first Yb doped optical fiber 2305 in amplifying the multi-wavelength light introduced into the first Yb doped optical fiber 2305.

The first optical fiber bundle 2304 is coupled to the pump light output from the fourth laser diode 2303 and the multi-wavelength light input to the amplification unit 230 'and enters the first Yb doped optical fiber 2305 .

The first ytterbium-doped optical fiber (YDF) 2305 transmits the multi-wavelength light input to the amplification unit 230 'through the first Yb doped optical fiber 2305 through the pumping action of the pump light output from the fourth laser diode 2303, The output gain is increased in a region of a predetermined wavelength depending on the characteristics of the gain medium of the gain medium. For convenience of explanation, the optical fiber for amplifying the multi-wavelength light in the predetermined wavelength region in the amplification unit 230 'is represented by Y-doped optical fiber (YDF) 235, but the present invention is not limited thereto. Instead of the Yb doped optical fiber (YDF), the amplifying unit 230 'may include an optical fiber doped with Erbium Doped Fiber (EDF) or another material in accordance with the wavelength band of the multi-wavelength light input to the amplifying unit 230' Can be used.

The isolator 2306 prevents amplification loss of the amplification unit 230 'by blocking multi-wavelength light amplified by the first Yb doped optical fiber 2305 from propagating in the reverse direction.

The monitoring port 2307 separates a portion of the output of the multi-wavelength light amplified by the first Yb doped optical fiber (YDF) 2305, and monitors the amplified multi-wavelength light.

The WDM coupler 2308 separates the broadband light of the backward component from the multiwavelength light of the forward component, thereby preventing the backward component of the broadband light from being re-introduced into the first Yb doped optical fiber 2305.

The fifth laser diode 2313 outputs pump light for pumping the second Yb doped optical fiber 2315 in re-amplifying the multi-wavelength light amplified by the first Yb doped optical fiber 2305.

The second optical fiber bundle (TFB) 2314 is formed by coupling the pump light output from the fifth laser diode 2313 with the multi-wavelength light amplified by the first Yb doping optical waveguide 2305 and the second Yb doped optical fiber (2315).

The second ytterbium-doped optical fiber (YDF) 2315 transmits the multi-wavelength light amplified by the first ytterbium-doped optical waveguide 2305 to the second ytterbium (Yb) doped via the pumping action of the pump- And increases the output gain in a region of a predetermined wavelength depending on the characteristics of the gain medium of the doped optical fiber 2315. [

For convenience of explanation, the optical fiber for amplifying the multi-wavelength light in the predetermined wavelength region in the amplification unit 230 'is represented by Y-doped optical fiber (YDF) 235, but the present invention is not limited thereto. Instead of the Yb doped optical fiber (YDF), the amplifying unit 230 'may include an optical fiber doped with Erbium Doped Fiber (EDF) or another material in accordance with the wavelength band of the multi-wavelength light input to the amplifying unit 230' Can be used. As described above, the amplifying unit 230 'can amplify the multi-wavelength light in two stages of the first Yb doped optical fiber (YDF) 2305 and the second Yb doped optical fiber (YDF) 2315. In the present embodiment, the optical fibers for amplifying the multi-wavelength light in the first and second steps are represented by the same type of Yb doped optical fiber, but the present invention is not limited thereto and optical fibers doped with different materials can be used.

The optical output apparatus 100 may further include a fourth laser diode 2303, a fifth laser diode 2313, a first laser diode 2313, and a third laser diode 2313 according to a desired optical spectrum shape and a spectral characteristic of pulse light input to the amplification unit 230 ' Doped optical fiber 2305 and the second ytterbium-doped optical fiber 2315 can be selected as the type of the laser diode and the type of the optical fiber, respectively.

The isolator 2316 prevents the amplification loss of the amplification unit 230 'by blocking the propagation of the multi-wavelength light amplified by the second Yb doped optical fiber 2315 in the reverse direction.

The monitoring port 2317 separates a portion of the output of the multi-wavelength light amplified by the second Yb doped fiber (YDF) 2315, and monitors the amplified multi-wavelength light.

The WDM coupler 2318 separates the broadband light of the backward component from the multiwavelength light of the forward component to prevent the backward component of the broadband light from being reintroduced into the second yb doped optical fiber 2315.

As described above, the amplifier 230 'of the optical output device 100 can be implemented in various forms. Accordingly, the optical output apparatus 100 amplifies the multi-wavelength light used as the pumping light source in the optical fiber 240 in various forms according to the characteristics of the light input to the amplification unit 230 ' Can output the light of the modified spectrum in the desired form.

5 is a view illustrating an optical output apparatus according to another embodiment of the present invention. 5, the optical output apparatus 100 includes a first laser diode 110, a second laser diode 120, a first laser diode control unit 131, a first polarization control unit 161, a second laser diode A second polarization controller 162, a monitoring port 211, a monitoring port 212, a variable attenuator (VA) 220, an amplification unit 230, and an optical fiber 240. The amplifying unit 230 includes a WDM coupler 231, an isolator 232, a fourth polarization controller 164, a fourth laser diode 233, a TFB (Tapered Fiber Bundle) 234 A ytterbium doped fiber (YDF) 235, an isolator 236, a monitoring port 237, a fifth polarization controller 165, and a WDM coupler 238.

The first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode control unit 132, the monitoring port 211, the monitoring port 212, The optical attenuator VA 220 and the optical fiber 240 are connected to the first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode 120, A monitoring port 211, a monitoring port 212, a variable attenuator (VA) 220, and an optical fiber 240. [ 3, the first laser diode 110, the second laser diode 120, the first laser diode control unit 131, the second laser diode control unit 132, the monitoring port 211, the monitoring port 212, 5, the second laser diode 120, the first laser diode control unit 131, the first laser diode control unit 131, the first laser diode control unit 131, the second laser diode control unit 131, It is also applicable to the second laser diode control unit 132, the monitoring port 211, the monitoring port 212, the optical attenuator (VA) 220 and the optical fiber 240, Is omitted.

The first laser diode control unit 131 controls the current applied to the first laser diode 110. The first laser diode 110 generates a first pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled according to the applied current. The first polarization controller 161 controls the polarization of the first pulse light output from the first laser diode 110. Accordingly, the first polarization controller 161 outputs the first pulse light controlled in a predetermined polarization state.

The second laser diode control unit 132 controls the current applied to the second laser diode 120. The second laser diode 120 generates second pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled in accordance with the applied current. The second polarization controller 162 controls the polarization of the second pulse light output from the second laser diode 120. Accordingly, the second polarization controller 162 outputs the second pulse light controlled to a predetermined polarization state.

The first pulse light and the second pulse light, respectively, whose polarization is controlled by the first polarization controller 161 and the second polarization controller 162, are input to the amplification unit 230. 5 further includes a fourth polarization controller 164 and a fifth polarization controller 165 as compared with the amplification unit 230 disclosed in FIG.

The fourth polarization controller 164 controls the polarization of the multi-wavelength light coupled by the WDM coupler 231. Accordingly, the fourth polarization controller 164 outputs multi-wavelength light controlled in a predetermined polarization state.

The multi-wavelength light whose polarization is controlled by the fourth polarization controller 164 is amplified by the optical fiber bundles (TFB 234) and the yttrium-doped optical fiber (YDF 235).

The fifth polarization controller 165 controls the amplified multi-wavelength light in the amplification unit 230 to output a predetermined polarization state.

The optical fiber 240 outputs light obtained as a result of pumping of the nonlinear gain medium based on the wavelength conversion characteristics of the nonlinear gain medium changed by the multi-wavelength light output from the amplification unit 230. According to this, the multi-wavelength light output from the amplification unit 230 acts as a pumping light source, and the optical fiber 240 outputs the light of which the wavelength band is modified according to the changed wavelength conversion characteristic of the nonlinear gain medium.

The nonlinear gain medium of the optical fiber 240 has a characteristic in which the wavelength conversion characteristic changes depending on the input pumping light source. The wavelength conversion characteristic is a characteristic that changes depending on the wavelength, intensity, and polarization of incident light when the light is transmitted through the optical fiber 240. Accordingly, the optical output apparatus 100 is configured to output the first pulse light by the first polarization controller 161, the second polarization controller 162, the fourth polarization controller 164, and the fifth polarization controller 165, The optical output apparatus 100 changes the wavelength conversion characteristics of the nonlinear gain medium by adjusting at least one of polarized light of the pulsed light, the multi-wavelength light, and the amplified multi-wavelength light, and the optical output apparatus 100 changes the characteristics of the desired type of spectrum Light can be output.

The optical output apparatus 100 includes at least one polarization controller (not shown) for controlling the polarization state of light in addition to the first polarization controller 161, the second polarization controller 162, the fourth polarization controller 164, and the fifth polarization controller 165 (Not shown).

FIG. 6 is a graph showing a change in optical spectrum of the light output from the optical output device under the control of the laser diode control unit shown in FIG. 1 to FIG.

The horizontal axis represents the wavelength (nm) and the vertical axis represents the relative spectral output (dB). The waveform 310, the waveform 320 and the waveform 330 are used to control the intensity, width, repetition rate, and polarization of each of the first pulse light and the second pulse light in the same optical output apparatus 100, . The optical output apparatus 100 controls the intensity, the width, the repetition rate, and the polarization of each of the first pulse light and the second pulse light by slightly differently using the laser diode control unit 130 and the polarization controller, The spectral waveforms of different types of light can be obtained. At this time, the optical output apparatus 100 can further control the polarization of the multi-wavelength light or the amplified multi-wavelength light in which the first pulse light and the second pulse light are combined using the plurality of polarization controllers.

Accordingly, the optical output apparatus 100 may control at least one of the intensity, the width, and the repetition rate of each of the first pulse light and the second pulse light so that light having a desired spectrum is output, or at least one polarization controller Thereby controlling any one of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light.

The optical output apparatus 100 shown in Fig. 7 is only shown in the components related to the present embodiment in order to prevent the characteristic of the present embodiment from being blurred. Therefore, it will be understood by those skilled in the art that other general-purpose components other than the components shown in FIG. 7 may be further included.

The optical output apparatus 100 controls currents applied to the first laser diode 110 and the second laser diode 120 and controls intensity, width, and repetition rate according to the currents applied to the first laser diode 110 The first pulse light of the first wavelength and the second pulse light of the second wavelength whose intensity, width and repetition rate are controlled according to the current applied to the second laser diode 120, Based on the wavelength conversion characteristics of the nonlinear gain medium of the optical fiber 150 including the nonlinear gain medium in which the wavelength conversion characteristic is changed according to the amplified multiwavelength light, And outputs light obtained as a result of pumping of the gain medium by the multi-wavelength light amplified by the amplifying unit 140. The optical output device 100 transmits light to the interferometer 420. Accordingly, the optical output apparatus 100 can output the spectrum light having the wavelength band broader than the spectrum of the multi-wavelength light input from the optical output apparatus 100 into the optical fiber 150. [

The optical output apparatus 100 may further include at least one polarization controller that adjusts at least one of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light. Accordingly, the optical output apparatus 100 can output at least one of the intensity, the width, the repetition rate, and the polarization of each of the first pulse light and the second pulse light, thereby outputting the desired type of spectrum light.

According to an embodiment, the optical output apparatus 100 may measure the intensity and width of each of the first pulse light and the second pulse light so that the light output from the optical output device 100 has a Gaussian light spectrum in the third wavelength range, The repetition rate, and the polarization.

According to another embodiment, the optical output apparatus 100 includes a first pulse light and a second pulse light so that the light output from the optical output device 100 has a flat optical spectrum in a third wavelength range. It is possible to control at least one of the intensity, the width, the repetition rate, and the polarization of each pulse light.

The interferometer 420 separates the light output from the optical output apparatus 100 into measurement light and reference light and irradiates the measurement light to the target object 10 and receives the response light reflected by the target object 10 do.

The interferometer 420 may include a beam splitter 422 and a reference mirror 424. The light transmitted from the optical output apparatus 100 is separated into the measurement light and the reference light in the beam splitter 422. [ Of the light separated by the beam splitter 422, the measurement light is transmitted to the optical probe 430, the reference light is transmitted to the reference mirror 424, reflected, and then returned to the beam splitter 422. On the other hand, the measurement light transmitted to the optical probe 430 is irradiated to the object 10 to be imaged through the optical probe 430, and the emitted measurement light is reflected by the target 10 Is transmitted to the beam splitter 422 through the optical probe 430. The transmitted response light and the reference light reflected by the reference mirror 424 cause interference in the beam splitter 422.

The optical probe 430 may include a collimator lens 432, a galvano scanner 434, and a lens 436. Here, the Galvano scanner 434 may be implemented as a MEMS scanner that obtains a driving force required for rotation from a MEMS (Micro Electro Mechanical System) as a mirror capable of rotating with a certain radius around a certain axis. The measurement light transmitted from the optical coupler 420 passes through the collimator lens 432 of the optical probe 430 and is collimated and is reflected by the galvanometer scanner 434 to adjust the direction of travel so that the lens 436 And may be irradiated to the object 10 after passing through the object.

The detector 440 detects an interference signal generated by the response light and the reference light. The detector 440 transmits the detected interference signal to the video signal processor 450.

The image signal processor 450 generates a tomographic image of the object 10 using the interference signal. The image signal processor 450 converts the interference signal into a video signal representing a tomographic image of the object 10.

8 is a flowchart illustrating a method of outputting light in accordance with an embodiment of the present invention. Referring to FIG. 8, the method shown in FIG. 8 is composed of steps that are processed in a time-series manner in the optical output devices shown in FIGS. 1 to 5 and FIG. Therefore, even if the contents are omitted in the following description, it can be understood that the above description about the optical output devices shown in Figs. 1 to 5 and Fig. 7 also applies to the method shown in Fig.

In step 510, the laser diode control unit 130 controls currents applied to at least two laser diodes. The laser diode control unit 130 may control at least one of the intensity, the width, and the repetition rate of each of the pulse lights generated by the laser diodes in order to shape the spectrum of the light output from the optical output apparatus 100.

According to one embodiment, the laser diode control unit 130 generates the laser output signal so that the light output from the optical output device 100 has a Gaussian shape optical spectrum in the third wavelength range The width, and the repetition rate of each of the pulsed light beams.

According to another embodiment, the laser diode control unit 130 generates the laser light having a flat optical spectrum in the third wavelength range, At least one of the intensity, the width, and the repetition rate of each of the pulse lights can be controlled.

In operation 520, at least two laser diodes generate pulse lights having different wavelengths, whose intensity, width, and repetition rate are controlled in accordance with the currents applied to at least two laser diodes.

In operation 530, the amplification unit 140 amplifies the multi-wavelength light in which the pulse lights generated from at least two laser diodes are combined. According to one embodiment, the optical output apparatus 100 may further include a polarization controller corresponding to each of the laser diodes, and the amplification unit 140 receives the pulsed light with the polarization adjusted by each polarization controller , And may amplify multi-wavelength light in which the pulsed lights with the polarization are combined. Alternatively, the amplification unit 140 may include at least one polarization controller to control the polarization of the multi-wavelength light to which the pulsed light is coupled, or to amplify the multi-wavelength light, and then to control the polarization of the amplified multi-wavelength light. The optical output apparatus 100 according to the present embodiment can shape at least one of the intensity, the width, and the repetition rate of each of the pulse lights, or can control the spectrum of the light outputted by adjusting the polarization of each of the pulse lights .

In step 540, the optical fiber 150 includes a nonlinear gain medium whose wavelength conversion characteristics vary according to the multiwavelength light amplified by the amplification unit 140, and the optical fiber 150 amplifies the nonlinear gain medium, And outputs light obtained as a result of pumping of the nonlinear gain medium by the multi-wavelength light amplified by the amplifying unit 140. At this time, the wavelength conversion characteristic of the nonlinear gain medium of the optical fiber 150 may be varied depending on the kind and composition ratio of the materials included in the nonlinear gain medium, and the geometry and length of the optical fiber 150.

Meanwhile, the above-described method can be implemented in a general-purpose digital computer that can be created as a program that can be executed by a computer and operates the program using a computer-readable recording medium. In addition, the structure of the data used in the above-described method can be recorded on a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), optical reading medium (e.g., CD ROM,

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed methods should be considered from an illustrative point of view, not from a restrictive point of view. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100 ... optical output device
110 ... first laser diode
120 ... second laser diode
130 ... laser diode control unit
140 ... amplifying unit
150 ... optical fiber

Claims (25)

In the optical output apparatus,
A first laser diode for generating pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled in accordance with an applied current;
A second laser diode for generating pulsed light of a second wavelength whose intensity, width, and repetition rate are controlled according to the applied current;
A laser diode control unit for controlling a current applied to the first laser diode and the second laser diode;
An amplifying unit for amplifying multi-wavelength light in which the first pulse light and the second pulse light are combined; And
A nonlinear gain medium in which a wavelength conversion characteristic is varied by an incident light, wherein the wavelength conversion characteristic of the nonlinear gain medium is changed based on the wavelength conversion characteristic of the nonlinear gain medium modified by the multiwavelength light amplified by the amplification unit, And an optical fiber for outputting light obtained as a result of the pumping. The method according to claim 1,
Further comprising at least one polarization controller for controlling at least one polarization of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light. 3. The method of claim 2,
Wherein the position of the at least one polarization controller can be changed according to a shape of a spectrum of light to be output from the optical output device. The method according to claim 1,
Wherein the laser diode control unit controls at least one of intensity, width, and repetition rate of each of the first pulse light and the second pulse light, or the at least one polarization controller controls the first pulse light, Wherein the optical output device shapes the spectrum of light output from the optical fiber by controlling one of polarized light of the multi-wavelength light and the amplified multi-wavelength light. The method according to claim 1,
The laser diode control unit controls the intensity, width, and repetition rate of each of the first pulse light and the second pulse light so that the light output from the optical fiber has a Gaussian shape optical spectrum in a third wavelength range. Wherein the at least one polarization controller controls at least one of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light, Output device. The method according to claim 1,
Wherein the laser diode control unit controls the intensity and width of the first pulse light and the second pulse light so that the light output from the optical fiber has a flat optical spectrum in a third wavelength range, Or at least one of the polarization controllers controls one of the first pulse light, the second pulse light, the multi-wavelength light, and the amplified multi-wavelength light, Device. The method according to claim 1,
Wherein the wavelength conversion characteristic of the nonlinear gain medium can be changed by changing at least one of a type and a composition ratio of materials included in the nonlinear gain medium and a geometry and a length of the optical fiber. The method according to claim 1,
Wherein the optical fiber is a high non-linear fiber (HNLF). The method according to claim 1,
Wherein the optical fiber is a high-birefringent optical fiber (Hi-Bi fiber). The method according to claim 1,
The nonlinear gain medium includes materials included in a nonlinear gain medium of a high nonlinear optical fiber (HNLF) and a high birefringent optical fiber (Hi-Bi fiber) according to a predetermined component ratio Wherein the light output device comprises: The method according to claim 1,
The amplifying unit
An optical fiber for increasing an output gain of the multi-wavelength light in a predetermined wavelength region according to characteristics of a gain medium to be pumped;
A fourth laser diode for emitting light of a fourth wavelength that promotes pumping of the gain medium of the optical fiber; And
And a tapered fiber bundle (TFB) for coupling the multi-wavelength light and the fourth wavelength light so that the light of the fourth wavelength is incident on the optical fiber. The method according to claim 1,
A first optical fiber for increasing an output gain of the multi-wavelength light in a predetermined wavelength region according to characteristics of a gain medium included therein;
A fourth laser diode for emitting light of a fourth wavelength that promotes pumping of the gain medium contained in the first optical fiber;
A first optical fiber bundle (TFB) for coupling the multi-wavelength light and the fourth wavelength light so that light of the fourth wavelength is incident on the first optical fiber;
A second optical fiber for increasing the output gain of the multi-wavelength light amplified by the first optical fiber in a predetermined wavelength region according to characteristics of the included gain medium;
A fifth laser diode that emits light of a fifth wavelength that promotes pumping of the gain medium included in the second optical fiber; And
And a second optical fiber bundle (TFB) that combines the multi-wavelength light amplified by the first optical fiber and the light of the fifth wavelength so that light of the fifth wavelength is incident on the second optical fiber Wherein the optical output device comprises: The method according to claim 1,
Further comprising: at least one laser diode for generating pulsed light whose intensity, width, and repetition rate are controlled in accordance with an applied current,
Wherein the amplifying unit amplifies the multi-wavelength light in which the first pulse light, the second pulse light, and the pulse light generated from the at least one laser diode are combined,
Wherein the laser diode control unit controls a current applied to the first laser diode, the second laser diode, and the at least one laser diode. 14. The method of claim 13,
At least one polarization controller for controlling at least one polarization of the first pulse light, the second pulse light, the pulse lights generated from the at least one laser diode, the multi-wavelength light, and the amplified multi-wavelength light; Further comprising a light source for emitting light. A method of outputting light in an optical output apparatus including at least two laser diodes,
Controlling a current applied to the at least two laser diodes;
Generating pulse lights having different wavelengths whose intensity, width, and repetition rate are controlled in accordance with the currents applied to the at least two laser diodes;
Amplifying multi-wavelength light in which pulse lights generated from the at least two laser diodes are combined;
Linear gain medium, the wavelength conversion characteristic of the nonlinear gain medium being changed by the amplified multi-wavelength light in an optical fiber including a nonlinear gain medium whose wavelength conversion characteristic is changed by the incident light, / RTI > 16. The method of claim 15,
The amplifying step
Receiving pulse lights generated from the at least two laser diodes;
Adjusting the polarization of each of the pulsed light beams generated from the at least two laser diodes;
Combining the pulsed light with the polarization control to generate one multi-wavelength light; And
And amplifying the multi-wavelength light. 16. The method of claim 15,
The amplifying step
Receiving pulse lights generated from the at least two laser diodes;
Combining the pulse lights generated from the at least two laser diodes to generate one multi-wavelength light;
Adjusting the polarization of the multi-wavelength light; And
And amplifying the polarization-controlled multi-wavelength light. 16. The method of claim 15,
The amplifying step
Receiving pulse lights generated from the at least two laser diodes;
Combining the pulse lights generated from the at least two laser diodes to generate one multi-wavelength light;
Emitting a fourth wavelength of light that promotes pumping of the gain medium contained in the first optical fiber;
Coupling the multi-wavelength light and the fourth wavelength light so that the light of the fourth wavelength is incident on the first optical fiber; And
And increasing an output gain of the multi-wavelength light in a predetermined wavelength region by the light of the fourth wavelength and the gain medium included in the first optical fiber. 16. The method of claim 15,
The amplifying step
Receiving pulse lights generated from the at least two laser diodes;
Combining the pulse lights generated from the at least two laser diodes to generate one multi-wavelength light;
Emitting a fourth wavelength of light that promotes pumping of the gain medium contained in the first optical fiber;
Coupling the multi-wavelength light and the fourth wavelength light so that the light of the fourth wavelength is incident on the first optical fiber;
Increasing an output gain of the multi-wavelength light in a predetermined wavelength region by the light of the fourth wavelength and the gain medium included in the first optical fiber;
Emitting light of a fifth wavelength that promotes pumping of the gain medium contained in the second optical fiber;
Combining the multi-wavelength light amplified by the first optical fiber and the light of the fifth wavelength so that the light of the fifth wavelength is incident on the second optical fiber; And
And increasing an output gain of the multi-wavelength light amplified by the first optical fiber in a predetermined wavelength region by the gain medium included in the light of the fifth wavelength and the gain medium included in the second optical fiber. 16. The method of claim 15,
Wherein the controlling step controls at least one of an intensity, a width, and a repetition rate of each of the pulse lights in order to shape a spectrum of light output from the optical output device. 17. The method of claim 16,
Wherein the optical output device controls at least one of an intensity, a width, and a repetition rate of each of the pulse lights to adjust a polarization of each of the pulse lights to shape a spectrum of light output from the optical fiber. 16. The method of claim 15,
Wherein the wavelength conversion characteristic of the nonlinear gain medium is changed by changing at least one of a type and a composition ratio of materials included in the nonlinear gain medium and a geometry and a length of the optical fiber. A computer-readable recording medium storing a program for causing a computer to execute the method according to any one of claims 15 to 22. An optical coherence tomography apparatus for photographing a single layer by irradiating light on a target object,
The first laser diode and the second laser diode are controlled to emit pulsed light of a first wavelength whose intensity, width, and repetition rate are controlled in accordance with the current applied to the first laser diode And emits a second pulse light of a second wavelength whose intensity, width, and repetition rate are controlled in accordance with the current applied to the second laser diode, and outputs the second pulse light of the second wavelength controlled by the multi- Linear gain medium of the optical fiber including a nonlinear gain medium in which the wavelength conversion characteristic is changed according to the amplified multi-wavelength light, amplifies the nonlinear gain medium by pumping the nonlinear gain medium by the amplified multi- An optical output device for outputting light obtained as a result of the light;
An interferometer for separating the output light into measurement light and reference light, irradiating the measurement light to the object, and receiving the response light reflected from the object;
A detector for detecting an interference signal generated by the response light and the reference light; And
And an image signal processor for generating a tomographic image of the object using the detected interference signal. 25. The method of claim 24,
Wherein the optical output device controls at least one of intensity, width, repetition rate, and polarization of each of the first pulse light and the second pulse light in order to shape a spectrum of light output from the optical output device The optical coherence tomography apparatus.

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