Integrated control system and control method for variable optical attenuator

Abstract

The invention relates to an integrated control system and control method for a variable optical attenuator. The system is provided with a configuration management module, an input quantity management module, an attenuation amount voltage lookup table, a first configurable timer, a second configurable timer, a third configurable timer, a table look-up management module, a PID (Proportion Integration Differentiation) input management module, a PID calculating speed management module, a PID calculating module and an output quantity management module. The method comprises the following steps of: starting the configuration management module; starting the input quantity management module; calculating a current actual attenuation amount; entering the table look-up management operation; entering the PID input management operation; calculating a current desired attenuation value and a current actual attenuation value; judging time timed by the second configurable timer; carrying out PID calculation; outputting a calculating result to the output quantity management module; calculating a current table look-up attenuation amount and a table look-up threshold set value; judging whether the current table look-up attenuation amount is less than or equal to the table look-up threshold set value or not; and judging whether time timed by the first configurable timer is up or not. By the integrated control system and control method, the control on different types of variable optical attenuators can be realized.

Description

technical field [0001] The invention relates to an optical attenuator. In particular, it relates to an integrated control system and control method for an adjustable optical attenuator. Background technique [0002] The main function of the optical attenuator is to reduce or control the optical signal. For example, in the WDM network system, it is used to narrow the energy gap between channels and maintain a constant signal-to-noise ratio (S / N) of all channels. Therefore, optical amplifiers, DWDM modules groups will be used. There are many types of manufacturing methods for optical attenuators, including changing the loss between a pair of fiber end faces by adjusting the air gap, or applying filters to affect incident light. These manufacturing methods can be used for both fixed and adjustable optical attenuators. Common adjustable optical attenuators, such as MEMS type, acousto-optic modulation type, etc., must ultimately control the optical attenuator through voltage / cu...

AI Technical Summary

Problems solved by technology

As an important unit of the optical network system, the adjustable optical attenuator needs to quickly respond to the increasingly complex requirements of the optical network, which highlights the shortcomings of the traditional control method that is too simple and simple in the control method of the optical network.

For example, in an EDFA design with an adjustable optical attenuator, in practical applications, when a transient occurs, it is required to quickly adjust the adjustable optical attenuator to compensate the slope of the gain, which requires a quick adjustment of the adjustable optical attenuator; and At the same time, if the function of the adjustable optical attenuator in the EDFA also includes the realization of the gain change function, adjusting the adjustable optical attenuator too quickly at this time will cause overshoot or undershoot of a single wavelength.

In this way, the above traditional control algorithms cannot better adapt to this complex demand.

Similarly, for different types of adjustable optical attenuators with different characteristics, in the known technology, it is often necessary to redesign the software to complete the control of different adjustable optical attenuators, which lacks flexibility.

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