CN-121983856-A - Laser and optical signal transmission system

Abstract

The embodiment of the application provides a laser and an optical signal transmission system, and relates to the technical field of photoelectricity. The laser includes a plurality of laser chips and a waveguide. Each laser chip comprises a first reflector, a second reflector and a resonant cavity positioned between the first reflector and the second reflector, the wavelengths of light output by different laser chips are different, and the propagation mode of the light in each laser chip is single. Different laser chips are connected through a waveguide, and the cross-sectional area of the waveguide is gradually changed along the length extension direction of the waveguide. The laser is connected with a plurality of laser chips in series through low loss, and light signal transmission is realized by adopting waveguides with gradually changed sections, so that the output port of the last laser outputs a multi-wavelength light source, and the problems of stress defect, multi-mode oscillation and the like caused by overlong cavity length of the traditional multi-section laser are avoided, and the output multi-wavelength light source has the characteristics of good single-mode characteristics, high integration level and low loss.

Inventors

• SHI YUECHUN
• YANG TONGTONG
• Yu Laiwen

Assignees

• 甬江实验室

Dates

Publication Date

20260505

Application Date

20251216

Priority Date

20250919

Claims (10)

1. 1. A laser device, which comprises a laser body, characterized by comprising the following steps: The laser device comprises a plurality of laser chips, a plurality of light emitting diodes and a plurality of light emitting diodes, wherein each laser chip comprises a first reflector, a second reflector and a resonant cavity positioned between the first reflector and the second reflector; And the cross-sectional area of the waveguide is gradually changed along the length extending direction of the waveguide.
2. 2. The laser of claim 1, wherein the plurality of laser chips are connected in series by the waveguide.
3. 3. The laser of claim 2, further comprising: The input port and the output port are respectively arranged in two laser chips which are positioned at the outermost side of the serial structure in the plurality of laser chips.
4. 4. The laser of claim 1, wherein a cavity length of the resonant cavity of each of the laser chips is less than or equal to 1mm.
5. 5. The laser of claim 1, wherein the cavity length of the resonant cavity of each laser chip is less than or equal to fifty times the wavelength of light output by itself.
6. 6. The laser of claim 1, wherein the plurality of laser chips are arranged in an array along a first direction and a second direction, the first direction being a length extension direction of the resonant cavity of the laser chips, the second direction being perpendicular to the first direction.
7. 7. The laser of claim 1, wherein a bragg grating is disposed within the resonant cavity of each of the laser chips, and wherein the bragg gratings in different ones of the plurality of laser chips have different phase shift positions or numbers of phase shifts.
8. 8. The laser of claim 1, wherein the waveguide is a polymer waveguide prepared using 3D printing techniques.
9. 9. The laser of claim 1, wherein the laser chip comprises a distributed feedback laser or a quantum cascade laser.
10. 10. An optical signal transmission system, comprising: The laser according to any one of claims 1 to 9; and the optical fiber, the detector or the photon chip is connected with the laser.

Description

Laser and optical signal transmission system Technical Field The application relates to the technical field of photoelectricity, in particular to a laser and an optical signal transmission system. Background Photonic integrated circuits (Photonic Integrated Circuit, PIC for short) are key technologies to deal with the field of optical communications by virtue of their compact size, low power consumption and cost advantages. However, its development is still subject to core light source performance and system integration bottlenecks. There are significant limitations to long cavity distributed feedback (Distributed Feedback, DFB for short) lasers in terms of lasers. Meanwhile, a longer resonant cavity also brings higher internal loss, so that the threshold current is increased and obvious temperature drift is caused, thereby influencing the reliability of the device. In terms of integration, the existing solutions mostly rely on assembling the laser chip with other discrete devices, and often require the introduction of coupling structures such as mode field adapters, micro lenses or turning mirrors. Although the method can combine the advantages of different structures, the coupling process depends on high-precision alignment and continuous monitoring, and has extremely high requirements on process equipment and a positioning system, so that the production cost is increased, namely the product yield is low, and high integration is difficult to realize. Disclosure of Invention The embodiment of the application provides a laser and an optical signal transmission system, which aim to realize the transmission of optical signals by connecting a plurality of laser chips in series with low loss and adopting waveguides with gradually changed sections, and realize the output of a multi-wavelength light source at one port, thereby avoiding the problems of stress defect, multimode oscillation and the like caused by overlong cavity length of the traditional multi-section laser and enabling the output multi-wavelength light source to have the characteristics of good single-mode characteristics, high integration level and low loss. In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme: in a first aspect, a laser is provided that includes a plurality of laser chips and a waveguide. Each laser chip comprises a first reflector, a second reflector and a resonant cavity positioned between the first reflector and the second reflector, the wavelengths of light output by different laser chips are different, and the propagation mode of the light in each laser chip is single. Different laser chips are connected through a waveguide, and the cross-sectional area of the waveguide is gradually changed along the length extension direction of the waveguide. In the laser provided by the embodiment of the application, by adopting an array structure formed by a plurality of laser chips, each laser chip has a single light propagation mode, the problems of poor reliability, multimode array oscillation and the like which are easy to occur due to overlong cavity length of a traditional long-cavity laser can be avoided, and the waveguide with gradually changed section is used for connecting adjacent laser chips in series to realize low-loss signal transmission, so that a multi-wavelength light source can be output at the port of the last laser chip, and the output multi-wavelength light source has the characteristics of good single-mode model, high integration level and low loss. In some embodiments, a plurality of laser chips are connected in series by waveguides. In some embodiments, the laser further comprises an input port and an output port, the input port and the output port being provided separately in a plurality of laser chips, in two laser chips located outermost in the series configuration. In some embodiments, the cavity length of the resonant cavity of each laser chip is less than or equal to 1mm. In some embodiments, the cavity length of the resonant cavity of each laser chip is less than or equal to fifty times the wavelength of the light output by itself. In some embodiments, the plurality of laser chips are arranged in an array along a first direction that is a length extension of the resonant cavity of the laser chips and a second direction that is perpendicular to the first direction. In some embodiments, a bragg grating is disposed in the resonant cavity of each laser chip, and the phase shift positions or the phase shift amounts of the bragg gratings in different laser chips are different among the plurality of laser chips. In some embodiments, the waveguide is a polymer waveguide prepared using 3D printing techniques. In some embodiments, the laser chip comprises a distributed feedback laser or a quantum cascade laser. In a second aspect, an optical signal transmission system is provided, including a laser and an optical fiber, detector, or photonic chip, the