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Wavelength-tunable laser system and control method thereof

A technology for tuning lasers and DFB lasers, which is applied in the field of lasers, can solve problems such as difficult to achieve real-time feedback control and unavailable lasers, and achieve the effects of simple structure, small size, and high control precision

Active Publication Date: 2013-02-13
GUILIN GUANGMING TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, highly precisely tuned lasers over a wide wavelength range are not available
[0003] On the other hand, in order to tune the output laser wavelength with high precision, it is necessary to measure the wavelength of the output laser light in real time with high precision. The existing general optical wavelength measurement device is difficult to meet the requirements of real-time feedback control
The wavelength meter based on Etalon has high precision, high resolution, and the scanning speed is significantly improved, but there is no report on its specific application in laser control

Method used

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  • Wavelength-tunable laser system and control method thereof
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  • Wavelength-tunable laser system and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] like figure 1 As shown, in this example, 20 DFB laser modules 1 are arranged in parallel on the same plane and in the same thermoelectric cooler (TEC), that is, A thermoelectric cooler 2 in the figure, and the laser beams generated by each DFB laser module 1 pass through the condenser lens 3 converging on the optical waveguide 4. This example is a one-dimensional DFB laser. A. The temperature range of the thermoelectric cooler 2 is 10-60°C. The wavelength adjustment range of the DFB laser in this example is 1525-1610 nm, with a total of 20 channels, and the wavelength interval of each channel is 4.5 nm.

[0040] figure 2 Shown is the structure of the wavelength tunable laser system in this example, including microprocessor, DFB laser, A thermoelectric cooler and A temperature sensor installed on it, M spectrometer, N spectrometer, direction monitoring photodiode array (direction monitoring PD array), B thermoelectric cooler and Etalon and B temperature sensors insta...

Embodiment 2

[0055] The DFB laser used in this example is also a one-dimensional DFB laser, such as Figure 5 As shown, 10 DFB laser modules 1 are fan-shaped and arranged on the same plane on the same A thermoelectric cooler 2, and the extension lines of the center lines of each DFB laser module 1 intersect at one point, that is, the laser light generated by them directly converges on the optical waveguide 4 .

[0056] Other structures are the same as in Embodiment 1.

[0057] Its method of use is the same as in Example 1.

[0058] The output laser beam produced by the wavelength tunable laser system and its control method in this example has a wavelength range of 1525-1568nm, covering the entire communication wavelength of the C-band, and the tuning accuracy is up to 1pm.

Embodiment 3

[0060] The DFB laser used in this example is as Image 6 As shown, 10 DFB laser modules 1 are parallel and side by side on the same plane, and the laser beams generated by each DFB laser module 1 are converged on the optical waveguide 4 through the condenser lens 3 to form a DFB laser module array. Two identical DFB laser module arrays are each placed in one A thermoelectric cooler 2, the two A thermoelectric coolers 2 are parallel and side by side, and the two optical waveguides are combined into one to form a grouped two-dimensional DFB laser.

[0061] The structure of the wavelength tunable laser system in this example is as follows Figure 7 As shown, its optical path and circuit are similar to Embodiment 1. The two DFB laser module arrays are respectively located on the two A thermoelectric coolers, and each of the two A thermoelectric coolers is equipped with an A temperature sensor. The first output terminal of the microprocessor is respectively connected to control e...

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Abstract

The invention relates to a high-precision wavelength-tunable laser system and a control method thereof. According to the high-precision wavelength-tunable laser system, a plurality of DFB (Distributed Feed Back) laser modules are arranged in parallel side by side or in a fan-shaped manner to form an array, and laser is converged in optical waveguide. DFB lasers are positioned in one or more TEC (Thermoelectric Cooler) as a single array or multiple arrays side by side or in a laminated manner. One path of a laser beam enters a direct monitoring PD (Photoelectric Diode), another path of the laser beam enters a wavelength locking PD through Etalon and the other path of the laser beam is output. A microprocessor receives signals input by a temperature sensor, the direction monitoring PD and the wavelength locking PD on each TEC and controls each DFB laser module, each TEC and a direction control mirror. The microprocessor selects certain DFB laser module to work according to the emission wavelength and controls the temperature of the TEC. The control method comprises the following steps of: controlling the TEC to roughly adjust the DFB output wavelength according to a theory, adjusting the TEC of the Etalon to a set temperature, obtaining the output laser wavelength according to the Etalon transmission efficiency and then accurately controlling the DFB output wavelength according to the output laser wavelength. The high-precision wavelength-tunable laser system and the control method thereof have the advantages of high precision, high stability, simple structure and capability of obtaining laser in the communication wavelength range of the whole C+L waveband.

Description

(1) Technical field [0001] The invention relates to the technical field of lasers, in particular to a high-precision wavelength tunable laser system and a control method thereof. (2) Background technology [0002] Tunable lasers are widely used in optical fiber communication and optical fiber sensors and other systems. Wavelength tunable lasers can greatly reduce the huge pressure on light source configuration, backup and maintenance of dense wavelength division multiplexing systems, and improve the cost performance of optical fiber networks. It is a current research hotspot. . A variety of wavelength tunable lasers have been developed, such as distributed feedback (DFB) lasers, external cavity lasers (ECL), microelectromechanical systems (MEMS) switching lasers, etc. Among them, the distributed feedback (DFB) laser has high stability, good spectrum and noise characteristics, good power output, low cost and mature technology. The wavelength change of DFB laser emission bas...

Claims

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Application Information

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IPC IPC(8): H01S5/40H01S5/068H01S5/024
Inventor 李严赵克
Owner GUILIN GUANGMING TECH IND
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