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Silicon-based optical modulator optical path monitoring structure

A silicon-based optical modulator and optical modulator technology, applied in the field of optical communication, can solve problems such as bias point locking deviation, transmission loss, phase error, etc., and achieve the effects of reducing transmission loss, overcoming locking deviation, and simple structure design

Active Publication Date: 2019-10-22
GUANGXUN SCI & TECH WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009]In the traditional modulator optical path monitoring structure, 2x2MMI optical couplers or split optical couplers are usually used to realize optical path monitoring, and phase errors are easily introduced when the output is reversed, resulting in The problem of bias point locking deviation may also cause additional transmission loss

Method used

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  • Silicon-based optical modulator optical path monitoring structure
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  • Silicon-based optical modulator optical path monitoring structure

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Embodiment 1

[0047] An embodiment of the present invention provides an optical path monitoring structure of a silicon-based optical modulator, the optical path monitoring structure is integrated with the optical modulator, and then monitors the optical path of the optical modulator. refer to Figure 3-Figure 6 , the optical modulator includes a beam combiner, and the beam combiner is a Y-type beam combiner or a multi-mode interference beam combiner. The optical path monitoring structure includes one or more optical probes, each optical probe is connected to a monitoring detector at the rear end; the one or more optical probes are respectively coupled to the output waveguide 011 of the beam combiner. When the input light at both ends of the beam combiner is anti-phase input, the interference cancels, the one or more optical probes can receive the scattered light after interference, and then detect the optical power, and the monitoring detector will correspond to the probe The detected opti...

Embodiment 2

[0060] On the basis of the above-mentioned embodiment 1, the optical modulator can also be a DP-IQ phase modulator, that is, the optical path monitoring structure in which two optical probes are set in the embodiment 1 is applied to the DP-IQ phase modulator, Such as Figure 8 shown. Wherein, the DP-IQ phase modulator is composed of four MZI modulator structures (that is, four single MZI silicon-based optical modulators), which are respectively X-I, X-Q, Y-I and Y-Q; the optical path monitoring structure is provided with 6, They are the first optical path monitoring structure 014, the second optical path monitoring structure 015, the third optical path monitoring structure 016, the fourth optical path monitoring structure 017, the fifth optical path monitoring structure 018 and the sixth optical path monitoring structure 019. As can be seen from the figure, each optical path monitoring structure includes two optical probes and two monitoring detectors, and the two optical pro...

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Abstract

The invention relates to the technical field of light communication, in particular to a silicon-based light modulator light path monitoring structure. The structure comprises one or more light probes,each of which is connected with a monitoring detector at the back end. The light path monitoring structure is integrated with a light modulator. The light modulator comprises a beam combiner. The oneor more light probes are coupled to the output waveguide of the beam combiner. When the phases of input light at the two ends of the beam combiner are opposite, the interference cancels. The one or more light probes receive the scattered light after interference and detect the light power. Each monitoring detector converts the light power detected by the corresponding probe into a light current.Under the condition of no additional increase in process difficulty, light path monitoring is realized by using the light probes and the monitoring detectors to receive the scattered light after interference. There is no phase shift when the output phases are opposite. The problem of bias point locking deviation can be overcome, and transmission loss brought by a beam splitter can be reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of optical communication, in particular to a silicon-based optical modulator optical path monitoring structure. 【Background technique】 [0002] Silicon photonics technology is a new generation of technology based on silicon materials, using the existing CMOS process for optical device development and integration, in optical communications, data centers, supercomputing, biology, national defense, AR / VR technology, smart cars and drones Many fields will play extremely critical roles. At present, silicon photonics technology is becoming more and more mature, and its advantages such as high integration, small size, low power consumption, and optoelectronic integration have attracted much attention. In the future, silicon photonics technology may replace the current free space coupling technology, and silicon photonics technology has long-term solutions The technical evolution (high speed, high integration) an...

Claims

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Application Information

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IPC IPC(8): G02F1/01
CPCG02F1/0136G02F1/0102
Inventor 梁雪瑞陈宏刚胡蕾蕾张博胡毅罗勇马卫东
Owner GUANGXUN SCI & TECH WUHAN
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