Dual-laser incoherent beat frequency noise elimination system and method based on passive pre-compensation mode

A dual-laser, elimination system technology, applied in the field of terahertz signal generation, can solve the problems of noise deterioration of terahertz signals, increase system cost, and limit the wide application of terahertz technology.

Active Publication Date: 2021-06-08
ZHEJIANG LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the impact of laser incoherent noise, it is often necessary to use a narrow linewidth laser, which greatly increases the system cost
In addition, methods based on master-slave laser injection locking or optical frequency comb filtering can avoid the influence of laser incoherent noise, but in order to achieve high-precision wide-range tuning, the method based on master-slave laser injection locking has higher requirements on slave lasers. However, the noise of the terahertz signal generated based on the optical frequency comb filtering method will deteriorate with the increase of the frequency. These factors limit the wide application of terahertz technology in wireless communication.

Method used

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  • Dual-laser incoherent beat frequency noise elimination system and method based on passive pre-compensation mode
  • Dual-laser incoherent beat frequency noise elimination system and method based on passive pre-compensation mode
  • Dual-laser incoherent beat frequency noise elimination system and method based on passive pre-compensation mode

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Embodiment 1

[0025] Such as figure 1 As shown, the dual-laser incoherent beat-frequency noise elimination system based on passive precompensation includes a first laser 1, a second laser 2, an optical frequency comb 3, a first optical coupler 4, a second optical coupler 5, and a second optical coupler. Three optical couplers 6 , fourth optical couplers 7 , fifth optical couplers 8 , first photodetectors 9 , second photodetectors 10 , electrical mixers 11 , and I / Q modulators 12 .

[0026] For the convenience of analysis, the constant phase term of each laser and each tooth of the optical frequency comb is ignored, and only the phase jitter of each laser and each tooth of the optical frequency comb is considered. Assume that the optical frequencies of the first laser 1 and the second laser 2 are ω 1 , ω 2 , and the phase jitter is Δφ 1 (t), Δφ 2 (t), the optical frequency of the comb teeth close to the first laser 1 in the optical frequency comb 3 is ω 3 , the optical frequency of the ...

Embodiment 2

[0029] Optionally, as another embodiment of the present invention, such as Figure 5 As shown, a dual-laser incoherent beat-frequency noise elimination system based on passive pre-compensation includes a first laser 1, a second laser 2, an optical frequency comb 3, a first optical coupler 4, and a second optical coupler 5. A third optical coupler 6 , a first photodetector 9 , and an I / Q modulator 12 . The first laser 1, the first optical coupler 4, and the I / Q modulator 12 are sequentially connected through optical fibers; the first optical coupler 4, the third optical coupler 6, and the first photodetector 9 are sequentially connected through optical fibers; The second laser 2, the second optical coupler 5, the optical frequency comb 3, and the third optical coupler 6 are sequentially connected through an optical fiber; the first photodetector 9 and the I / Q modulator 12 are sequentially connected through a microwave coaxial line .

[0030] This embodiment 2 and figure 1 Th...

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Abstract

The invention discloses a dual-laser incoherent beat frequency noise elimination system and method based on a passive pre-compensation mode. The system comprises a first laser, a second laser, an optical frequency comb, a first optical coupler, a second optical coupler, a third optical coupler, a fourth optical coupler, a fifth optical coupler, a first photoelectric detector, a second photoelectric detector, an electric mixer and an I/Q modulator. According to the invention, incoherent beat frequency noise between the double lasers can be eliminated, so that a low-phase-noise terahertz signal is generated, a traditional complex coherent control mode based on the electric control feedback double lasers does not need to be adopted, the system and method have the characteristics of low cost, easiness in implementation and the like, and a practical terahertz light source generation scheme is provided for the terahertz technology and application thereof.

Description

technical field [0001] The invention relates to the field of terahertz signal generation, in particular to a method and system for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation. Background technique [0002] With the development of applications such as sensory networks, high-definition video streaming devices, ultra-high-resolution video surveillance, high-throughput wireless networks, virtual reality, and augmented reality, it is expected that the peak rate of wireless transmission data will reach 100Gbps or even higher in 2030. Higher transmission rates require higher transmission bandwidth support, but traditional all-electric or microwave photonic technologies are difficult to meet the requirements of high transmission rates of one hundred gigabits. Therefore, sub-terahertz and terahertz (100GHz-10THz) frequency bands based on microwave photonics technology, which have large bandwidth and can carry large amounts of data, have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/90H04B10/50H04B10/516
CPCH04B10/90H04B10/503H04B10/516
Inventor 朱翔余显斌
Owner ZHEJIANG LAB
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