Device and method for stabilizing any bias point of external modulator

A technology of external modulator and stabilizing device, which is applied in the field of optical communication and can solve problems such as inability to achieve bias

Active Publication Date: 2015-09-09
一叁一九(北京)光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the technology based on power detection, the technology based on the jitter signal is relatively mature, and some merchants have launched commercial modules, but due to t

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  • Device and method for stabilizing any bias point of external modulator
  • Device and method for stabilizing any bias point of external modulator
  • Device and method for stabilizing any bias point of external modulator

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Embodiment Construction

[0032] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0033] Figure 1a Schematic diagram of the external modulator structure, Figure 1b It is a schematic diagram of the transfer function curve of the external modulator, and its output function is:

[0034] P o ( t ) = kP i 2 [ 1 + cos ( φ 0 + φ 1 + Δφ ) ]

[0035] where P i is the input optical power, k is the insertion loss of th...

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Abstract

The invention relates to a device and method for stabilizing any bias point of an external modulator, wherein the device comprises a laser, a variable optical attenuator, a lithium niobate modulator, an optical coupler, a signal source, a driving amplifier and a feedback control part; the device can be used for collecting a feedback signal and setting a bias voltage via a data acquisition board in the feedback control part so as to stabilize any bias point. The device and the method of the invention solve the problem that an optimal bias point of the modulator is drifted and an output signal is degraded because of changes of factors such as time, environment temperature, laser luminous power, and optical fiber inserting and coupling loss. The device and the method can be applied in the optical communication field, especially high-speed long distance communication in the optical communication field.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a device and method for stabilizing an arbitrary bias point of an external modulator. Background technique [0002] The most commonly used in high-speed long-distance communication is LiNbO3 (lithium niobate) Mach-Zehnder (M-Z) external modulator, which has many advantages: using traveling wave electrodes, it can obtain a high working rate; the frequency chirp of the modulated signal is very Small; the wavelength dependence of the performance is small; the optical loss is low; the electro-optical coefficient is high, and it is suitable for a variety of code types, etc. The transfer function of the M-Z external modulator is a nonlinear function, generally a periodic function. In order to avoid signal distortion, the modulator must work at the best bias point. However, the optimal bias point is not stable, and it will drift with time, ambient temperature, laser optical power, ...

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Application Information

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IPC IPC(8): H04B10/516
Inventor 李宇鹏袁学光张阳安张锦南
Owner 一叁一九(北京)光电科技有限公司
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