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Double-drive M-Z optical single sideband modulator with high sideband rejection ratio

A single sideband modulator and band suppression technology, which is applied in optics, optical components, instruments, etc., can solve the problems of low output signal sideband suppression ratio, affecting signal transmission quality, etc., and achieve the effect of improving the sideband suppression ratio

Active Publication Date: 2020-09-01
THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, the optical power of the upper and lower arm waveguides and the modulation depth of the upper and lower arm waveguide signals are affected by the waveguide and electrode processing technology and the power distribution ratio of the microwave hybrid coupler, and the sideband suppression ratio of the output signal is generally lower than Relatively low, thus affecting the transmission quality of the signal

Method used

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  • Double-drive M-Z optical single sideband modulator with high sideband rejection ratio
  • Double-drive M-Z optical single sideband modulator with high sideband rejection ratio
  • Double-drive M-Z optical single sideband modulator with high sideband rejection ratio

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Embodiment 1

[0034] Such as figure 2 As shown, this embodiment includes a substrate 1, an optical waveguide, a radio frequency electrode and a bias electrode, the substrate 1 is a Z-cut lithium niobate substrate, and the optical waveguide is preferably prepared by using a lithium niobate material through a titanium diffusion process Double polarization waveguide or single polarization waveguide prepared by proton exchange process, of course, polarization waveguide prepared by other processes can also be used; the optical waveguide includes input straight waveguide 20, adjustable Y branch waveguide 22, upper arm waveguide 23, lower arm waveguide 24 , the beam-combining area waveguide 25 and the output straight waveguide 26, and the position of the substrate 1 corresponding to the adjustable Y-branch waveguide 22 is provided with an adjustment electrode.

[0035] Such as image 3 As shown, the adjustable Y branch waveguide 22 includes a transition section waveguide 100, an upper input conn...

Embodiment 2

[0060] The difference between this embodiment and Embodiment 1 is that the structures of the adjustable Y branch waveguide 22 and the adjustment electrode are different, such as Figure 4As shown, in this embodiment, the adjustable Y branch waveguide 22 includes a transition section waveguide 100, an upper input connection waveguide 101, an upper parallel adjustment straight waveguide 102, an upper coupling connection waveguide 103, an upper parallel coupling straight waveguide 104, an upper output Connecting waveguide 105, lower input connecting waveguide 111, lower parallel adjustment straight waveguide 112, lower coupling connecting waveguide 113, lower parallel coupling straight waveguide 114 and lower output connecting waveguide 115, the first end of the transition section waveguide 100 is connected to the input straight waveguide 20 connection, the first end of the upper parallel adjustment straight waveguide 102 is connected to the second end of the transition section wa...

Embodiment 3

[0064] Such as Figure 5 As shown, this embodiment includes a substrate 1, an optical waveguide, a radio frequency electrode and a bias electrode, the substrate 1 is an X-cut lithium niobate substrate, and the optical waveguide is preferably prepared by using a lithium niobate material through a titanium diffusion process Double polarization waveguide or single polarization waveguide prepared by proton exchange process, of course, polarization waveguide prepared by other processes can also be used; the optical waveguide includes input straight waveguide 20, adjustable Y branch waveguide 22, upper arm waveguide 23, lower arm waveguide 24 , the beam-combining area waveguide 25 and the output straight waveguide 26, and the position of the substrate 1 corresponding to the adjustable Y-branch waveguide 22 is provided with an adjustment electrode.

[0065] Such as Figure 6 As shown, the adjustable Y branch waveguide 22 includes a transition section waveguide 100, an upper input co...

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Abstract

The invention discloses a dual-drive M-Z optical single sideband modulator with a high sideband rejection ratio. The device comprises a substrate, an optical waveguide, a radio frequency electrode anda bias electrode; the substrate is made of a photoelectric material; the optical waveguide comprises an input straight waveguide, an adjustable Y-branch waveguide, an upper arm waveguide, a lower armwaveguide, a beam combining area waveguide and an output straight waveguide; and an adjusting electrode is arranged at the position, corresponding to the adjustable Y-branch waveguide, of the substrate. According to the invention, a Y-branch waveguide is replaced by an adjustable Y-branch waveguide; the adjusting electrode is correspondingly arranged; the splitting ratio is adjusted in the adjustable Y-branch waveguide, and thus the influence of non-ideal preparation process of the Y-branch waveguide device on the sideband rejection ratio can be compensated; and the influence of non-equal half-wave voltage of two-arm waveguides of the device and non-ideal power distribution of a microwave hybrid coupler on the sideband rejection ratio can be compensated by adjusting the splitting ratio, so that the sideband rejection ratio of the optical single sideband modulator is improved.

Description

technical field [0001] The invention relates to the field of optical single sideband modulators, in particular to a dual-drive M-Z optical single sideband modulator with high sideband suppression ratio. Background technique [0002] Optical fiber wireless communication technology is an effective solution for ultra-broadband wireless access, and it is also an important application field of microwave photonics. In the optical fiber wireless communication system, due to the fiber dispersion effect of the traditional double sideband modulation technology, the millimeter wave components generated by the upper and lower optical sidebands and the carrier beat frequency will have different phase differences with the transmission distance, resulting in periodic attenuation of the signal, which greatly The transmission distance of the optical fiber communication system is limited, in order to solve this problem, the single sideband modulation technology came into being. The optical S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/12G02B6/122G02B6/125G02B6/126G02B6/134H04B10/516
CPCG02B6/12G02B6/122G02B6/125G02B6/126G02B6/1345H04B10/5165G02B2006/1204G02B2006/12142G02B2006/12183
Inventor 华勇李淼淼杨千泽吴磊
Owner THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP
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