Wavelength-tunable laser based on March-Zehnder interferometer and reflecting grating

A technology for tuning lasers and reflection gratings, which is applied to devices that control the output parameters of lasers, structures of optical resonators, etc., can solve problems such as a wide tunable range, and achieve the effect of avoiding the assembly process, obvious performance and price advantages.

Inactive Publication Date: 2012-08-22
SICHUAN MARS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The representative of the traditional tunable laser scheme is the DBR (distributed Bragg reflector) laser, which is characterized in that the active region generating gain and the DBR region generating reflection are formed in the same laser element, but its tunable range is not wide , generally no more than 10nm

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  • Wavelength-tunable laser based on March-Zehnder interferometer and reflecting grating
  • Wavelength-tunable laser based on March-Zehnder interferometer and reflecting grating
  • Wavelength-tunable laser based on March-Zehnder interferometer and reflecting grating

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Embodiment 1

[0041] Such as figure 1 As shown, the schematic diagram of the top view structure of the wavelength tunable laser based on the compound MZI and reflection grating according to the first embodiment of the present invention, it includes an active gain chip 3, which is used to generate broadband spontaneous emission photons as an excitation light source; The source photonic chip 4 serves as an external cavity to provide wavelength tunable feedback, and generates laser output with tunable wavelength. Each of the active gain chip 3 and the passive photonic chip 4 has a waveguide (optical waveguide), and the two chips are coupled and docked through the waveguide core; the docking of the active gain chip 3 and the passive photonic chip 4 is by placing the Optimal coupling is achieved by precise optical alignment of the waveguide core.

[0042] The waveguide in the passive photonic chip 4 includes an input waveguide 5, a first coupler 6, a second coupler 9, a first waveguide arm 7, a...

Embodiment 2

[0062] Such as Figure 4 As shown, the structural principle diagram of the second embodiment of the present invention, the structure of this embodiment is basically the same as that of the first embodiment, the difference is that the mirror of the second mirror section 801 is also a sampling grating or a superstructured grating, and the second The two sides of the waveguide core of the reflector section 801 are symmetrically provided with metal electrodes 13 . Such as Figure 5 As shown, the free spectral ranges of the sampling gratings or superstructure gratings of the second mirror section 801 and the first mirror section 701 are different but close; their corresponding comb reflection peaks 30, 31; 32, 33; 34, 35; 36, 37; 38, 39 have similar reflection strengths. The laser coupling phase adjustment section 702 is arranged between the first coupler 6 and the first mirror section 701, and the laser power phase adjustment section 703 is arranged between the second coupler 9 ...

Embodiment 3

[0065] Such as Figure 7 As shown, the structural principle diagram of the second embodiment of the present invention, the structure of this embodiment is basically the same as that of the first embodiment, the difference is that: the mirror of the first mirror section 701 is composed of a waveguide Bragg grating, and the waveguide Bragg grating The number of at least two, the specific number can be set according to the needs of tuning, the number of waveguide Bragg gratings in this embodiment is five. The electrodes 121, 122, 123, 124, and 125 of the first mirror section are symmetrically arranged on both sides of the waveguide core of each waveguide Bragg grating; the mirror of the second mirror section 801 is a sampling grating or a superstructure grating The wavelengths of the reflection peaks of each waveguide Bragg grating are respectively close to the wavelengths of the corresponding reflection peaks in the comb-shaped reflection peak distribution of the sampling gratin...

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Abstract

The invention discloses a wavelength-tunable laser based on a March-Zehnder interferometer and a reflecting grating. The wavelength-tunable laser comprises an active gain chip and a passive photonic chip. A waveguide in the passive photonic chip comprises an input waveguide, a first coupler, a second coupler, a first waveguide arm, a second waveguide arm and an output waveguide. A laser generation phase regulating section is arranged on the input waveguide. A first reflecting mirror section is arranged on the first waveguide arm. A second reflecting mirror section is arranged on the second waveguide arm. A laser coupling phase regulating section is arranged between the first coupler and the first reflecting mirror section or the second reflecting mirror section. A laser power phase regulating section is arranged between the second coupler and the first reflecting mirror section or the second reflecting mirror section. Each section is provided with an electrode. By alternatively changing the waveguide refraction index of the first reflecting mirror section or the second reflecting mirror section and further regulating the laser generation phase regulating section, the incremental tuning of laser output wavelength is realized. The wavelength-tunable laser based on the March-Zehnder interferometer and the reflecting grating has the advantages that the output wavelength can be continuously or selectively changed and a very wide wavelength range can be covered.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to a wavelength tunable laser based on a compound MZI and a reflective grating. 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 achieved by directly modulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/10H01S5/06
Inventor 李若林
Owner SICHUAN MARS TECH
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