External cavity type single-wavelength tunable laser using FP (Fabry-Perot) laser as grain light source

A technology for tuning lasers and lasers, which is applied to devices for controlling laser output parameters, structures of optical resonators, etc., can solve the problems of wide laser spectrum range, etc., and achieve the effect of small size and high-speed digital signal transmission with adjustable wavelength.

Inactive Publication Date: 2014-04-09
SICHUAN MARS TECH
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Problems solved by technology

[0005] The traditional FP (Fabry-Perot) laser refers to the Fabry-Perot laser, which has a Fabry-Perot resonant cavity. There are several peaks, the position distribution of these wavelength peaks and the distance between them (called free spectral range) are determined by the gain curve, optical refractive index and length of the chip, and the positions of these wavelength peaks are distributed in a comb shape, its disadvantages Yes: within a certain wavelength range, the laser emits a wide spectral range

Method used

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  • External cavity type single-wavelength tunable laser using FP (Fabry-Perot) laser as grain light source
  • External cavity type single-wavelength tunable laser using FP (Fabry-Perot) laser as grain light source
  • External cavity type single-wavelength tunable laser using FP (Fabry-Perot) laser as grain light source

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Embodiment 1

[0045] Such as figure 1 , figure 2 The shown external cavity single-wavelength tunable laser using FP laser as the gain light source includes an FP laser chip 13 for generating an excitation light source, which is made of a compound semiconductor material. There is an optical waveguide 1 in the FP laser chip. The waveguide 1 is fully or partially covered with a driving electrode 15 for injecting electrons into the active area, and generates broadband spontaneous emission photons near a certain central wavelength through electron-photon conversion; The transmissive partial reflective film 3 is coated with a high reflective film 2 on the end surface of the other port, and the reflectivity of the high reflective film is greater than 95%; on the side of the optical waveguide port where the excitation light source is derived, sequentially set the emission beam for the excitation light source Optical lens 6 for beam expansion and collimation, optical etalon 8 with comb-shaped dist...

Embodiment 2

[0060] Such as Figure 8-11 Shown is the second embodiment of the present invention, the difference between the second embodiment and the first embodiment is that the optical waveguide 1 of the FP laser has a port leading out the excitation light source and a port outputting the laser light, and the end faces of the two ports are provided with Partially transmissive and partially reflective films 3, 3′, the reflectivity and transmittance of these two partially transmissive and partially reflective films can be different, and are set according to laser resonance conditions and output requirements; on the side of the optical waveguide port where the excitation light source is derived, An optical lens 6 for expanding and collimating the emission beam of the excitation light source, an optical etalon 8 with comb-shaped distribution transmission spectrum characteristics for transmitting and filtering the emission beam of the excitation light source, and an optical lens 8 for transmi...

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Abstract

The invention discloses an external cavity type single-wavelength tunable laser using an FP (Fabry-Perot) laser as a grain light source. The external cavity type single-wavelength tunable laser comprises an FP laser chip; light waveguide is arranged in the FP laser chip; a partial transmission and reflection lens is arranged on the end face of a port for deriving an excitation light source in an optical waveguide port, and a high-reflection membrane is arranged on the end face of the other port; and an optical lens, an optical etalon for carrying out transmission filtering on a transmission light beam of the excitation light source, and a partial reflector for carrying out partial reflection and partial transmission on light beams transmitting the optical etalon are arranged at one side of the port for deriving the excitation light source in the optical waveguide port in sequence. One wavelength peak of the excitation light source is overlapped to one wavelength position of a transmission peak of the optical etalon by changing the distribution of a comb-shaped wavelength wave of the excitation light source, or changing the distribution of the comb-shaped wavelength peak of the excitation light source and the transmission peak of the optical etalon, so that maximum feedback is obtained by a wavelength of a photon at an overlapped position. With the adoption of the external cavity type single-wavelength tunable laser provided by the invention, single-wavelength laser can be output, and a wavelength of output laser can be continuously or selectively changed.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to an external cavity single-wavelength tunable laser using an FP multimode laser as a gain light source. Background technique [0002] Wavelength Division Multiplexing (WDM) has been widely used in optical fiber communication systems. A wavelength division multiplexed optoelectronic transponder consists of a laser, a modulator, a receiver and associated electronics. The operation of the WDM converter can be realized by a fixed-wavelength laser at the near-infrared wavelength of 1550nm. Due to the ease of operation and high reliability, distributed feedback (DFB) lasers are widely used in WDM transmission systems. In the DFB laser, the diffraction grating that provides optical feedback is located above the entire gain resonant cavity, so that the laser will obtain a stable single-mode oscillation at a fixed wavelength. Also, information transmission at low digital rates can also be achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/14H01S5/06
Inventor 李若林
Owner SICHUAN MARS TECH
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