A system and method for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation

A dual-laser, elimination system technology, applied in the field of terahertz signal generation, can solve problems such as noise deterioration of terahertz signals, limiting the wide application of terahertz technology, and increasing system costs.

Active Publication Date: 2022-03-04
ZHEJIANG LAB
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  • Abstract
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  • Claims
  • Application Information

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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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  • A system and method for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation
  • A system and method for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation
  • A system and method for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation

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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 system and method for eliminating incoherent beat frequency noise of dual lasers based on passive precompensation, including a first laser, a second laser, an optical frequency comb, a first optical coupler, a second optical coupler, A third photocoupler, a fourth photocoupler, a fifth photocoupler, a first photodetector, a second photodetector, an electrical mixer, and an I / Q modulator. The invention can eliminate the incoherent beat frequency noise between the two lasers, thereby generating a low-phase-noise terahertz signal, and does not need to adopt the traditional and complex coherent control method based on the electronically controlled feedback dual lasers, and has the characteristics of low cost and easy implementation. Provide a practical terahertz light source generation scheme for terahertz technology and its applications.

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 Patents(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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