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Silicon-based modulator

A modulator, a silicon-based technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of low modulation rate, excessive modulation voltage, and low extinction ratio, and achieve high modulation efficiency, high extinction ratio, and energy saving volume effect

Inactive Publication Date: 2017-01-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People have successively designed finger-type modulators, U-shaped PN node modulators, etc., but sti

Method used

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Examples

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Embodiment 1

[0043] In this embodiment, the first group of waveguides is one waveguide, the second group of waveguides is one waveguide, the lengths of the first group of waveguides and the second group of waveguides are not equal, and the length difference is equal to that of the light corresponding to the distance difference.

[0044] Such as figure 1 As shown: the light is distributed to the waveguide Select1 or Select2 through the Optic switch, and then coupled out through the optic coupler (optical coupler). The length difference between the waveguides Select1 and Select2 can be precisely controlled. In the silicon-based waveguide, when the length difference of the two arms is 270nm, a fixed π phase difference is generated. Considering the nature of the silicon material, its phase difference hardly changes with wavelength and temperature.

Embodiment 2

[0046]In this embodiment, the first group of waveguides includes one waveguide, the second group of waveguides includes one waveguide, and a phase controller is connected to the first group of waveguides, or a phase controller is connected to the second group of waveguides. A phase controller, or a phase controller is respectively connected to the first group of waveguides and the second group of waveguides.

[0047] Considering the process error of different production lines, it can be considered to design two arms of equal length or unequal length, for one arm (or two arms, such as figure 2 As shown) add a phase controller such as a heater (thermal phase shifter) to realize the phase difference of the two arms. This control changes slowly and does not affect the modulation performance. It can also be considered that the two arms have a fixed phase difference.

[0048] Then, when the Optic switch adjusts the light to pass through Select1, the π phase is obtained, and when th...

Embodiment 3

[0051] The Optic switch of WSM can adopt the microring structure, such as image 3 As shown, when the microring satisfies the resonance condition, the light is coupled to the waveguide Select1 through the microring, and the phase π is obtained. When the resonance condition of the microring is broken, the light passes through Select2 directly, and phase 0 is obtained.

[0052] In order to obtain a high modulation rate, the microring can use a phase controller with a PN junction structure to control the change of the refractive index of the microring through signals. At a certain wavelength, when the signal is 1, the microring is under resonance conditions (control devices such as a heater (thermal phase shifter) can be added to the outside of the microring, so that it is always under resonance conditions at this time), and the light passes through Select2 to modulate the phase π . When the signal is 0, the resonance condition of the microring is destroyed, the light passes th...

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Abstract

The invention provides a silicon-based modulator. The silicon-based modulator comprises an optical circuit selector, two groups of waveguides and an optical coupler. The optical circuit selector is used for receiving input light and controlling light to input into a first group of waveguides and a second group of waveguides under control of an electric signal. One ends of the first group of waveguides and the second group of waveguides are connected with the optical circuit selector and the other ends are connected to the optical coupler. The first group of waveguides or the second group of waveguides is used for outputting light into the optical coupler. The optical paths of the first group of waveguides and the second group of waveguides are not the same. The difference between the optical paths corresponds to the phase difference to be obtained. The silicon-based modulator has following beneficial effects: the silicon-based modulator is featured by high modulation efficiency, high modulation speed and high extinction ratio and can save the size of a silicon chip.

Description

technical field [0001] The invention relates to the field of silicon photon integration, in particular to a silicon-based modulator. Background technique [0002] After the development of microelectronics technology, it has been predicted by Moore's Law that "the integration of semiconductor chips doubles every 18 months, while the price is reduced by half." However, silicon-based microelectronics technology has become increasingly It is getting closer and closer to the physical limit, and it is difficult to continue to follow Moore's Law to develop. At the same time, in the field of optical communication, optical devices have been plagued by high power consumption, high cost, and large volume. The emergence of silicon photonics technology can solve many problems in the fields of microelectronics and optical communication at the same time. Silicon photonics technology is to produce electronic devices and photonic devices with mature semiconductor technology. However, ther...

Claims

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Application Information

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IPC IPC(8): G02F1/225
CPCG02F1/225G02F1/212
Inventor 尚冬冬
Owner ZTE CORP