Operating point self-stabilization type thin film lithium niobate Mach-Zehnder electro-optical modulator

Abstract

The invention provides an operation point self-stabilization type thin film lithium niobate Mach-Zehnder electro-optical modulator. Modulation arms are arranged between a 2*2MMI structure and a 1*2 light splitting structure, the upper modulation arm and the lower modulation arm are designed to be completely symmetrical, and modulation electrodes which are symmetrically designed are arranged on the two sides of the modulation arms and have a signal loading effect; the symmetrical electrode structures also ensure that no phase difference is introduced between the upper arm and the lower arm of the Mach-Zehnder interference structure, light enters from one input port of the 2*2MMI structure or the 1*2 light splitting structure, and due to the self-imaging effect of the 2*2MMI structure, the phase difference of pi / 2 can be introduced, so that the operation point of the modulator is automatically stabilized at a 3dB working point, other control devices do not need to be applied to adjust and stabilize the operation point, and the operation point is not influenced by external factors such as time and temperature and can be stably kept still in the central position of the linear working area for a long time.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a working point self-stabilizing thin-film lithium niobate Mach-Zehnder electro-optic modulator. Background technique [0002] With the rapid development of 5G communication, the demand for large capacity and high speed of information in modern communication continues to increase. As a high-speed, high-bandwidth, and multi-dimensional transmission medium, optical communication technology develops rapidly. Optical modulators are used as a A device that converts electrical signals into optical signals. With the maturity of semiconductor technology and the rapid development of integrated photonic technology, Mach-Zehnder electro-optic modulator is an important modulation device, which is widely used in many fields such as optical fiber communication, multiplexing technology and quantum optics. field. [0003] Usually, the electrode voltage applied by the MZI modulator has a cha...

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Problems solved by technology

[0004] The existing electro-optic modulators have some deficiencies in the process of use and need to be improved. First of all, in the actual environment, the MZI modulator is easily affected by temperature, external pressure and mechanical vibration, which leads to the drift of the operating point in the linear region. , which deviates from the previously set bias operating point, resulting in a decrease in the stability of the output signal and affecting the transmission performance of the entire optical communication system. Therefore, it is necessary to monitor the working status of the MZI, and correct it in time after the drift occurs to make it return to The initially set bias operating point can realize the stability and compensation of the MZI operating point by means of external circuits and some automatic control systems, but these methods often require more complex systematic design, involving many circuit control parts, which greatly increase the device Cost, different designs have different stability to the working point

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