External-cavity laser device with tunable wave length

Abstract

The invention aims to provide an external-cavity laser device with a tunable wave length. Particularly, the external-cavity laser comprises a laser gain chip, one or more lens units, an optical etalon and a reflector, wherein the one or more lens units, the optical etalon and the reflector are located on one side of the laser gain chip and constitute an external-cavity feedback region; the end face, facing the external-cavity feedback region, of the laser gain chip is plated with an antireflection film, and the other end face of the laser gain chip is plated with a partial-transmission partial-reflection film; from the side, plated with the antireflection film, of the laser gain chip, the one or more lens units, the optical etalon and the reflector are sequentially arranged; the one or more lens units, the optical etalon and the reflector are arranged so as to make the external-cavity feedback region and the laser gain chip constitute a laser resonant cavity. Compared with the prior art, the external-cavity laser device has the advantages of having the large-range output wave length of a multi-longitudinal-mode laser, high reliability, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a technology of a wavelength-tunable external cavity laser. Background technique [0002] Wavelength Division Multiplexing PON (WDM-PON, Wavelength Division Multiplexing PON) is the most visionary and scalable solution to provide end users with high bandwidth, which combines the advantages of WDM technology and PON topology. WDM technology refers to the technology of combining several channels of modulated optical signals through a multiplexer (or wavelength division multiplexer) according to a certain wavelength interval and transmitting them through an optical fiber. In the WDM-PON system, when the Optical Network Unit (ONU, Optical Network Unit) performs data uplink transmission, lasers with different wavelengths must be used, and in the WDM-PON system, due to the ease of operation and high reliability, distributed Feedback (DFB, Distributed Feedback) lasers are widely used, b...

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Problems solved by technology

In the WDM-PON system, when the optical network unit (ONU, Optical Network Unit) performs data uplink transmission, lasers with different wavelengths must be used, and in the WDM-PON system, due to the ease of operation and high reliability, distributed Feedback (DFB, Distributed Feedback) lasers are widely used, but the bandwidth of DFB lasers is not wide enough to achieve wavelength tuning in a wide range. Therefore, DFB lasers cannot meet the wavelength range required by multiple ONUs. The use of DFB laser technology in WDM-PON systems will not only lead to expensive wavelength management costs, but also cause serious storage problems

To solve this problem, so far, Arrayed Waveguide Gratin (AWG, Arrayed Waveguide Gratin) technology is mainly used. By controlling the current and temperature of the laser, and tuning the wavelength of the grating Bragg (Bragg), the uncoated Fabry-Perot The external cavity laser composed of FP (FP, Fabry-Pero) laser and grating can output single-mode light at different wavelengths, but the side-mode suppression ratio (SMSR, Side-Mode Suppression Ratio) and reliability of this technology need to be further improved

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