Method for controlling bias voltage of cascaded electro-optical modulator, and controller
An electro-optic modulator and bias voltage technology, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of complex operation, poor stability, and inability to automatically adjust two-stage electro-optic modulators at the same time, so as to avoid mutual interference and ensure The effect of stability
Pending Publication Date: 2020-02-28
SHENZHEN PAGE PRECISION SYST
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However, for the application scenario of modulator cascading, this type of bias voltage controller is susceptible to system interference, and cannot automatically adjust the two-stage electro-optic modulator at the same time, and the operation is complicated and the stability is poor.
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[0083] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0084] see figure 1 , as shown in the figure, the cascaded electro-optic modulator bias voltage control system 100 includes a laser light source 101, a radio frequency electrical signal 102, a first-stage electro-optic modulator 103, a second-stage electro-optic modulator 104, a fiber splitter 105 and a bias Set the voltage controller 106.
[0085] Wherein, the laser light source 101 is used to output laser signals.
[0086] The first-stage electro-optic modulator 103 and the second-stage electro-optic modulator 104 are cascaded, and the radio frequency electrical signal 102 is respectively outpu...
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The invention relates to the technical field of electro-optical modulation, and discloses a method for controlling bias voltage of a cascaded electro-optical modulator, and a controller. The method comprises the following steps of respectively outputting a first working bias voltage and a first pilot frequency signal to a first-stage electro-optical modulator, outputting a second working bias voltage and a second pilot frequency signal to a second-stage electro-optical modulator, collecting optical signals modulated by the first-stage electro-optical modulator and the second-stage electro-optical modulator which are cascaded as feedback signals, respectively calculating working bias voltages of the first-stage electro-optical modulator and the second-stage electro-optical modulator by analyzing components of the feedback signals, and enabling the two stages of electro-optical modulators to work at the optimal working points by outputting the working bias voltages. By simultaneously outputting pilot signals with different frequencies and amplitudes to the two stages of electro-optical modulators, the mutual interference of the pilot frequencies of the two optical modulators in the cascaded controller can be avoided, and the working stability of a circuit in the cascaded system is ensured.
Description
technical field [0001] The invention relates to the technical field of electro-optic modulation, in particular to a method for controlling the bias voltage of a cascaded electro-optic modulator and a controller. Background technique [0002] The optical modulator is used to modulate the radio frequency signal and the optical carrier output by the laser to form an optical signal. Among them, the optical modulator is widely used in the fields of optical fiber communication and optical fiber sensing. The response of the electro-optic modulator under different bias voltage conditions appears to be in the shape of a cosine function. In order to make the electro-optic modulator work at different operating points and present a specific response state, a bias voltage can be output to the optical modulator. [0003] However, since the optical modulator is extremely sensitive to changes in the working environment, changes in the working environment, such as temperature changes, humid...
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Login to View More IPC IPC(8): G02F1/01
CPCG02F1/0123Y02D30/70
Inventor 尹深泉房冰陈宇奇徐圣东
Owner SHENZHEN PAGE PRECISION SYST