All-optical tunable multichannel filter based on periodically polarized lithium niobate crystal

A periodic polarization, lithium niobate technology, applied in the field of optical communication and microwave photonics, can solve the problem of inability to achieve multi-channel all-optical tunability, and achieve strong practical operability, flexible application, and convenient simultaneous filtering. Effect

Active Publication Date: 2021-07-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Based on the above ideas, the present invention uses the sum-frequency effect in the periodically polarized lithium niobate crystal to consume the input signal light, and proposes a fully The optically tunable band-stop filter realizes simultaneous filtering of multiple channels by injecting multiple wavelengths of pump light, and realizes the central wavelength and extinction ratio of each filter channel by controlling the wavelength and power of the pump light. tunable, thus overcoming the shortcomings of existing optical band-stop filters that cannot realize multi-channel all-optical tunability

Method used

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  • All-optical tunable multichannel filter based on periodically polarized lithium niobate crystal
  • All-optical tunable multichannel filter based on periodically polarized lithium niobate crystal
  • All-optical tunable multichannel filter based on periodically polarized lithium niobate crystal

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Embodiment

[0023] image 3 , Figure 4 and Figure 5 The simulation results of an embodiment of the multi-wavelength filter disclosed in the present invention are given. In this embodiment, the frequency doubling quasi-phase matching wavelength of the periodically poled lithium niobate crystal is 1556 nm. image 3 The transmittance of the corresponding output signal light is given when the three input pump light wavelengths are 1560nm, 1564nm and 1569nm respectively. It can be seen from the figure that the device realizes the notch filtering of the three channels of 1552nm, 1547nm and 1542nm at the same time, and the maximum extinction ratio reaches -28.32dB. Figure 4 The output results of all-optical tuning achieved by changing the wavelength of the pump light are given. exist image 3 On the basis of , adjust the wavelengths of the first two pump lights to 1558nm and 1565nm respectively, while the wavelength of the third pump light remains unchanged at 1569nm, then the center wav...

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Abstract

The invention provides an all-optical tunable multichannel filter based on a periodically poled lithium niobate crystal and belongs to the field of optical communication and microwave photonics. According to the filter, the sum frequency effect in the second-order nonlinear effect of the periodically polarized lithium niobate crystal is utilized to realize the filtering of signals, simultaneous filtering of multiple channels can be realized by inputting the pump light with multiple wavelengths, and the central wavelength and extinction ratio of the filtering channels can realize the all-optical tuning; tuning characteristics of the channels are independent and do not influence each other, and the filter has the characteristics of simple structure, multi-channel simultaneous filtering, convenient tuning and the like.

Description

technical field [0001] The invention belongs to the fields of optical communication and microwave photonics, in particular to an all-optical tunable multi-channel filter based on periodically polarized lithium niobate crystals. Background technique [0002] In the field of optical communication and microwave photonics, optical fiber is often used as a physical medium for information transmission, forming a fiber optic communication network or a fiber optic microwave photonic system. In these transmission applications, the use of wavelength division multiplexing technology can greatly expand the transmission signal bandwidth on a limited physical medium. In the process of signal transmission, it is often necessary to process the communication signal or microwave signal modulated on the light, such as filtering is a common signal processing. The traditional processing method at the transmission intermediate node is to convert the optical signal into an electrical signal, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/355G02F1/37G02F1/35
CPCG02F1/3551G02F1/37G02F1/3544
Inventor 胡哲峰程书停孙宇哲陈开鑫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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