Dispersion-adjustable dispersion management device based on large chirp fiber grating

Abstract

The utility model discloses a dispersion management device with adjustable dispersion based on a large chirp fiber grating, which comprises a front end of a light path and a rear end of the light path, a dispersion and wavelength adjusting module is arranged between the front end of the light path and the rear end of the light path, the front end of the light path inputs a laser signal, and the rear end of the light path inputs a laser signal. The light is output to the rear end of the light path through the dispersion and wavelength adjustment module; the tension control module and the temperature control module are electrically connected with the dispersion and wavelength adjustment module, the tension control module is used for adjusting the dispersion of the large chirp fiber grating, and the temperature control module is used for controlling the central wavelength of the large chirp fiber grating. And the tension control module and the temperature control module are electrically connected with the control system. The device is simple and compact in structure, flexible and light, larger in tuning range and high in stability, and can better meet the requirements of actual work.

Description

Technical Field

[0001] The utility model relates to the technical field of optical systems, in particular to a dispersion management device with adjustable dispersion based on large chirp optical fiber gratings. Background Art

[0002] Dispersion in optical media is the phenomenon that the phase velocity and group velocity of light propagating in a transparent medium vary with frequency. The dispersion characteristics have a significant impact on the transmission of pulses, because pulses have a certain spectral width range, which causes the frequency components to be transmitted at different speeds. Under normal dispersion conditions, the group velocity of the high-frequency part is smaller, thus producing positive chirp, while anomalous dispersion produces negative chirp. The dispersion amount opposite to the pulse can be used to compress the pulse, while the dispersion amount equal to the pulse can be used to broaden the pulse. Therefore, dispersion management is of great significance to the realization of stable and reliable pulsed lasers. Utility Model Content

[0003] The utility model aims to address the deficiencies of the prior art and provide a dispersion management device with adjustable dispersion based on a large chirp fiber grating, comprising a front end and a rear end of an optical path, wherein a dispersion and wavelength adjustment module is arranged between the front end and the rear end of the optical path, a laser signal is input to the front end of the optical path, and is output to the rear end of the optical path through the dispersion and wavelength adjustment module, so as to achieve dispersion management of the optical path; the utility model also comprises a tension control module and a temperature control module electrically connected to the dispersion and wavelength adjustment module, wherein the tension control module is used to adjust the dispersion of the large chirp fiber grating, and the temperature control module is used to control the central wavelength of the large chirp fiber grating, and the tension control module and the temperature control module are both electrically connected to a control system, and the control system is used to control the operation of the entire device.

[0004] Preferably, the dispersion and wavelength adjustment module is composed of a housing, a large chirp fiber grating, a plurality of tension arms, and a fiber grating base, and is used to implement dispersion management and wavelength control.

[0005] Preferably, the tension control module is composed of several one-dimensional piezoelectric nanopositioning stages connected to a controller system, and the one-dimensional piezoelectric nanopositioning stages are installed between the housing of the dispersion and wavelength adjustment module and the top of the tension arm.

[0006] Preferably, the temperature control module is composed of a controller, a plurality of semiconductor refrigeration sheets and a plurality of water cooling devices. The semiconductor refrigeration sheet is attached to the bottom of the fiber grating base in the dispersion and wavelength adjustment module and is connected to the controller through wires. The water cooling device is attached to the other side of the semiconductor refrigeration sheet and is connected to the controller through wires.

[0007] Preferably, the control system consists of a control circuit and connecting lines, which are connected to the temperature control module and the tension control module.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The utility model adjusts the dispersion of the large chirp fiber grating by driving the tension module, and the temperature controller controls the central wavelength of the large chirp fiber grating to achieve dispersion management under the condition of controllable wavelength. The utility model has a simple and compact structure, a flexible and light device, a larger tuning range, and high stability, which better meets the needs of practical work. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0011] Figure 1 It is a structural block diagram of the utility model;

[0012] Figure 2 It is a structural diagram of the dispersion and wavelength adjustment module of the structural block diagram of the utility model. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0014] Reference Figure 1 and Figure 2 The utility model discloses a dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating, a dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating, comprising a front end 5 of an optical path and a rear end 6 of the optical path, a dispersion and wavelength adjustment module 2 is arranged between the front end of the optical path and the rear end of the optical path, a laser signal is input to the front end of the optical path, and is output to the rear end of the optical path through the dispersion and wavelength adjustment module, so as to achieve dispersion management of the optical path; and also comprises a tension control module 1 and a temperature control module 3 electrically connected to the dispersion and wavelength adjustment module, the tension control module is used to The dispersion of the large chirp fiber grating is adjusted, and the temperature control module is used to control the central wavelength of the large chirp fiber grating. The tension control module and the temperature control module are both electrically connected to the control system 4, and the control system is used to control the operation of the entire device. The utility model drives the tension module through piezoelectric ceramics to adjust the dispersion of the large chirp fiber grating, and the temperature controller controls the central wavelength of the large chirp fiber grating to achieve dispersion management under the condition of controllable wavelength. The structure is simple and compact, the device is flexible and light, the tuning range is larger, the stability is high, and the needs of actual work are better met.

[0015] The dispersion and wavelength adjustment module is composed of a housing, a large chirp fiber grating 11, a plurality of tension arms 10, and a fiber grating base 12, and is used to implement dispersion management and wavelength control; the tension control module is composed of a plurality of one-dimensional piezoelectric nanopositioning stages connected to the control system, and the one-dimensional piezoelectric nanopositioning stages are installed between the housing of the dispersion and wavelength adjustment module and the top of the tension arm; the temperature control module is composed of a controller, a plurality of semiconductor cooling sheets and a plurality of water cooling devices, and the semiconductor cooling sheets are attached to the bottom of the fiber grating base in the dispersion and wavelength adjustment module, and are controlled by the temperature control module. The wires are connected to the controller, and the water cooling device is attached to the other side of the semiconductor refrigeration plate and connected to the controller through the wires. The temperature control module is used to precisely control the temperature of the large chirp fiber grating to achieve precise tuning of the central wavelength. The control system consists of a control circuit and connecting wires, which are connected to the temperature control module and the tension control module to control the operation of the entire device. The modules are connected through circuits to form a dispersion management device based on the large chirp fiber grating with adjustable dispersion, which realizes the dispersion management function of adjustable dispersion and the central wavelength control and tuning function.

[0016] In the utility model, several water cooling devices are installed at the end of the shell, and then semiconductor cooling plates are installed on the corresponding water cooling devices, and then the fiber grating base is installed on the semiconductor cooling plate, and then the large chirp fiber grating is tightly attached to the V-shaped groove on the fiber grating base, and then several one-dimensional piezoelectric nanopositioning stages (such as Figure 2 The structure requires two), and then Figure 2 The two metal parts at the top are respectively mounted on two one-dimensional piezoelectric nanopositioning stages, and the V-shaped groove at the bottom of the metal parts is fixed to the fiber Bragg grating extending from the fiber Bragg grating base with glue, and then all the lines are connected and the bottom cover of the shell is installed to complete the assembly of a dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating. When in use, the two ends of the fiber Bragg grating are respectively connected to the front end and the back end of the optical path that needs to be dispersed to achieve dispersion management.

[0017] The utility model can realize large-scale dispersion adjustment by replacing large-chirp fiber Bragg gratings, and can also realize small-scale dispersion adjustment by tension control; it does not require a complex optical path system, has a simple structure, and can realize large-scale dispersion adjustment by replacing the fiber Bragg gratings; it does not require preheating, has a fast tuning speed, can realize the dispersion latch function, and can restore the state before power failure after power failure; it has a simple structure and a small size, and can be suitable for more applications; it does not require a complex cantilever beam structure, and can realize the control and tuning of the fiber Bragg grating center wavelength; there is no tuning blank and the accuracy is higher.

[0018] As above, although the utility model has been shown and described with reference to a specific preferred embodiment, it should not be interpreted as limiting the utility model itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the utility model defined in the attached claims.

Claims

1. A dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating, characterized in that: The optical fiber grating comprises a front end and a rear end of the optical path, wherein a dispersion and wavelength adjustment module is arranged between the front end and the rear end of the optical path, a laser signal is input into the front end of the optical path, and is output to the rear end of the optical path through the dispersion and wavelength adjustment module, so as to realize the dispersion management of the optical path; the optical fiber grating comprises a tension control module and a temperature control module electrically connected to the dispersion and wavelength adjustment module, wherein the tension control module is used to adjust the dispersion of the large chirp optical fiber grating, and the temperature control module is used to control the central wavelength of the large chirp optical fiber grating, and the tension control module and the temperature control module are both electrically connected to the control system, and the control system is used to control the operation of the entire device.

2. The dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating according to claim 1, characterized in that: The dispersion and wavelength adjustment module is composed of a housing, a large chirp fiber grating, a plurality of tension arms, and a fiber grating base, and is used to implement dispersion management and wavelength control.

3. The dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating according to claim 2, characterized in that: The tension control module is composed of several one-dimensional piezoelectric nanopositioning stages connected to a controller system, and the one-dimensional piezoelectric nanopositioning stages are installed between the shell of the dispersion and wavelength adjustment module and the top of the tension arm.

4. The dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating according to claim 3, characterized in that: The temperature control module is composed of a controller, a plurality of semiconductor cooling sheets and a plurality of water cooling devices. The semiconductor cooling sheet is attached to the bottom of the fiber grating base in the dispersion and wavelength adjustment module and is connected to the controller through wires. The water cooling device is attached to the other side of the semiconductor cooling sheet and is connected to the controller through wires.

5. The dispersion management device with adjustable dispersion based on large chirp fiber Bragg grating according to claim 4, characterized in that: The control system consists of a control circuit and connecting lines, and is connected to a temperature control module and a tension control module.

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