Fiber bragg grating tuning method and device thereof

Abstract

The invention discloses a fiber bragg grating tuning method and a device thereof. A layer of organic polymer is coated on the surface of a fiber bragg grating, the temperature of the organic polymer is adjusted and controlled, and the fiber bragg grating bonded to the organic polymer can generate deformation because the organic polymer expands with heat and contracts with cold so that the center wave length of the fiber bragg grating is changed and the tuning is realized. The organic polymer has higher sensitivity on temperature than that of the fiber bragg grating so that the fiber bragg grating has large change extent of the wave length, high speed and high accuracy through the effect of expansion with heat and contraction with cold of the organic polymer, thus, the high-efficient tuning can be achieved. The invention also discloses a device for implementing the tuning method, and has the advantages of simple structure, high tuning accuracy, good stability and wide application values.

Description

technical field

[0001] The invention belongs to the technical field of fiber grating tuning, and in particular relates to a fiber grating tuning method and device. Background technique

[0002] Fiber Bragg grating plays a very important role in real life, and its applications in optical fiber communication are mainly dispersion compensation and pulse width compression, up / down voice multiplexer and wave device, wavelength division multiplexer / demultiplexer; The application in the laser is to use the frequency selection function of the fiber grating, so that the resonator can only feed back light of a specific wavelength and output single-frequency light. In addition, fiber gratings can also be used in erbium-doped fiber amplifiers as gain flat compensation devices; in fiber sensing systems, because the reflected wave wavelength of fiber gratings has a good linear relationship with stress, strain, temperature and other parameters, so The corresponding fiber grating sensor fi...

Examples

Embodiment 1

[0015] Example 1 as figure 1 As shown, the device includes a fiber Bragg grating 11, an organic polymer polyimide 12 coated on the surface of the fiber grating, a tungsten wire 13, a variable resistor 14 and a circuit board (not shown in the figure). In this embodiment, the tungsten wire and the variable resistor are temperature control modules. The length of the fiber Bragg grating is 20mm, the fiber Bragg grating wavelength is 1550.03nm; the length of the polyimide coating is 20mm; the length of the tungsten wire is 30mm, the fiber Bragg grating and the tungsten wire are close together, and the two ends of the tungsten wire are welded On the board, in parallel with the variable resistor. The voltage across the tungsten wire is controlled by changing the resistance of the variable resistor, that is, the surface temperature of the tungsten wire is controlled, thereby controlling the stretching degree of the polyimide coating layer, so that the central wavelength of the fiber ...

Embodiment 2

[0016] Example 2 as image 3 As shown, the device includes a fiber grating 31 , an organic polymer acrylate 32 coated on the surface of the fiber grating, a tungsten wire 33 , a variable resistor 34 and a vacuum sleeve 35 . In this embodiment, the tungsten wire, the variable resistor and the vacuum sleeve are temperature control modules. The length of the fiber grating is 20mm, the coating length of the organic polymer is 20mm; the length of the tungsten wire is 30mm; the length of the vacuum sleeve is 20mm, and the diameter is 15mm. The end is inserted and soldered on the circuit board, connected in parallel with the variable resistor, and the fiber grating is placed near the central axis of the vacuum sleeve parallel to the tungsten wire. The voltage at both ends of the tungsten wire is controlled by changing the resistance of the variable resistor, that is, the temperature distribution in the vacuum sleeve is controlled, thereby controlling the stretching degree of the org...

Embodiment 3

[0017] Example 3 as Figure 4 As shown, the device includes a fiber grating 41 , an organic polymer polyetherimide 42 coated on the surface of the fiber grating, and a thermostat 43 . In this embodiment, the thermostat is a temperature control module. The length of the fiber grating is 20 mm, and the coating length of the organic polymer is 20 mm. The fiber grating coated with organic polymer is placed in a constant temperature box. The stretching degree of the organic polymer coating layer is controlled by changing the constant temperature value of the thermostat, so that the central wavelength of the fiber grating changes with the change of temperature.

technical field

[0001] The invention belongs to the technical field of fiber grating tuning, and in particular relates to a fiber grating tuning method and device. Background technique

[0002] Fiber Bragg grating plays a very important role in real life, and its applications in optical fiber communication are mainly dispersion compensation and pulse width compression, up / down voice multiplexer and wave device, wavelength division multiplexer / demultiplexer; The application in the laser is to use the frequency selection function of the fiber grating, so that the resonator can only feed back light of a specific wavelength and output single-frequency light. In addition, fiber gratings can also be used in erbium-doped fiber amplifiers as gain flat compensation devices; in fiber sensing systems, because the reflected wave wavelength of fiber gratings has a good linear relationship with stress, strain, temperature and other parameters, so The corresponding fiber grating sensor fi...

Examples

Embodiment 1

[0015] Example 1 as figure 1 As shown, the device includes a fiber Bragg grating 11, an organic polymer polyimide 12 coated on the surface of the fiber grating, a tungsten wire 13, a variable resistor 14 and a circuit board (not shown in the figure). In this embodiment, the tungsten wire and the variable resistor are temperature control modules. The length of the fiber Bragg grating is 20mm, the fiber Bragg grating wavelength is 1550.03nm; the length of the polyimide coating is 20mm; the length of the tungsten wire is 30mm, the fiber Bragg grating and the tungsten wire are close together, and the two ends of the tungsten wire are welded On the board, in parallel with the variable resistor. The voltage across the tungsten wire is controlled by changing the resistance of the variable resistor, that is, the surface temperature of the tungsten wire is controlled, thereby controlling the stretching degree of the polyimide coating layer, so that the central wavelength of the fiber ...

Embodiment 2

[0016] Example 2 as image 3 As shown, the device includes a fiber grating 31 , an organic polymer acrylate 32 coated on the surface of the fiber grating, a tungsten wire 33 , a variable resistor 34 and a vacuum sleeve 35 . In this embodiment, the tungsten wire, the variable resistor and the vacuum sleeve are temperature control modules. The length of the fiber grating is 20mm, the coating length of the organic polymer is 20mm; the length of the tungsten wire is 30mm; the length of the vacuum sleeve is 20mm, and the diameter is 15mm. The end is inserted and soldered on the circuit board, connected in parallel with the variable resistor, and the fiber grating is placed near the central axis of the vacuum sleeve parallel to the tungsten wire. The voltage at both ends of the tungsten wire is controlled by changing the resistance of the variable resistor, that is, the temperature distribution in the vacuum sleeve is controlled, thereby controlling the stretching degree of the org...

Embodiment 3

[0017] Example 3 as Figure 4 As shown, the device includes a fiber grating 41 , an organic polymer polyetherimide 42 coated on the surface of the fiber grating, and a thermostat 43 . In this embodiment, the thermostat is a temperature control module. The length of the fiber grating is 20 mm, and the coating length of the organic polymer is 20 mm. The fiber grating coated with organic polymer is placed in a constant temperature box. The stretching degree of the organic polymer coating layer is controlled by changing the constant temperature value of the thermostat, so that the central wavelength of the fiber grating changes with the change of temperature.

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