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All-optical diode controllable unidirectional optical transmission device and method

An all-optical diode and optical transmission technology, which is applied in the field of micro-nano photonics, can solve the problems such as controllable reversal of the conduction direction of signal light, and achieves the effect of simple structure and operation, and easy integration.

Active Publication Date: 2019-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, almost all current all-optical diodes can only reverse the conduction direction of signal light in different wavelength bands, but cannot achieve controllable reversal of the conduction direction for signal light of the same wavelength.

Method used

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  • All-optical diode controllable unidirectional optical transmission device and method
  • All-optical diode controllable unidirectional optical transmission device and method
  • All-optical diode controllable unidirectional optical transmission device and method

Examples

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Effect test

Embodiment 1

[0039] like figure 1 As shown, an all-optical diode controllable unidirectional optical transmission device in this embodiment includes a wavelength-tunable continuous wave laser (CW LD) 1, a first variable optical attenuator (VOA) 2, and a power-tunable ultrashort pulse Laser (Pulsed LD) 3, Variable Optical Delay Line (VODL) 4, Second Variable Optical Attenuator (VOA) 5, Fiber Coupler (FC) 6, Polarization Controller (PC) 7, Lens Fiber (LF ) 8. Asymmetric photonic crystal microcavity-waveguide structure 9, lens fiber (LF) 10, photodetector (PD) 11.

[0040] The wavelength tunable continuous wave laser 1 is used to provide signal light, its wavelength is continuously adjustable from 1529nm to 1609nm, the tuning accuracy is 1MHz, and the spectral line width is 100kHz; the ultrashort pulse laser 3 is used to provide pump light, and its center wavelength is λ= (1550±2)nm, the pulse width is 200fs, and the repetition frequency is 350MHz.

[0041] like figure 2 As shown, the pho...

Embodiment 2

[0052] A kind of all-optical diode controllable unidirectional optical transmission device of this embodiment, in order to realize the controllable reversal of the conduction direction of the all-optical diode under the same signal light wavelength switch to reverse conduction), except for the following features, all the other features are the same as in Embodiment 1.

[0053] Delay the emission time t of the ultrashort pulse laser 3 relative to the continuous wave laser 1 d set as Figure 4 Arbitrary values ​​shown in the middle triangle, these values ​​represent the pulse delay time t required for the signal light to travel backward in order to reach the high transmission state of the microcavity bistability d value.

[0054] The signal light emitted by the continuous wave laser 1 is reversely incident from the photonic crystal waveguide 14 on the right side, and the adjustable optical delay line 4 is used to set the delayed emission time of the ultrashort pulse laser 3 co...

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Abstract

The invention discloses an all-optical diode controllable unidirectional optical transmission device and method. The device comprises a wavelength tunable continuous wave laser, a power adjustable ultrashort pulse laser, a dimmable delay line and an asymmetric photonic crystal microcavity-waveguide structure. The all-optical diode controllable unidirectional optical transmission device utilizes the significant length difference of photonic crystal waveguides on the left and right sides of a photonic crystal microcavity, so that the nonlinear interaction of microcavity signal light, ultrashortpulse pumping light and a microcavity resonance mode change under the same ultrashort pulse pumping conditions and the dynamic evolution of transmitted light is remarkably affected. Therefore, by finely adjusting the delayed transmitting time of pulse pumping light relative to the signal light, the microcavity can be in different bistable states when the signal light is transmitted forwardly and reversely, and accordingly high-contrast controllable unidirectional optical transmission of the signal light with any wave length in a bandwidth interval in the entire nonlinear bistable state interval of the microcavity can be achieved.

Description

technical field [0001] The invention relates to the field of micro-nano photonics, in particular to an all-optical diode controllable unidirectional light transmission device and method based on an asymmetric microcavity-waveguide structure. Background technique [0002] The all-optical diode is an important micro-nano optical device, and its purpose is to realize the non-reciprocal transmission of light, that is, to allow light to transmit in only one direction, while the light transmission in the opposite direction is suppressed. This is very similar to the one-way transmission effect of an electronic diode with a p-n junction, so it has broad application prospects in the fields of all-optical computing, laser technology, and all-optical information processing. [0003] Breaking the time-reversal symmetry of light transport is the key to realizing all-optical diodes. At present, many different mechanisms and methods have been proposed to realize the non-reciprocal transmi...

Claims

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Application Information

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IPC IPC(8): G02B6/28G02B6/122G02F1/35G02F3/02
CPCG02F1/35G02F3/024G02B6/1225G02B6/2861Y02D30/70
Inventor 李潮吴俊芳吴淑雅
Owner SOUTH CHINA UNIV OF TECH
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