Optical mean power controller with provisionable output levels

Optics: measuring and testing – Standard – Surface standard

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Details

356394, 356229, 356230, G01J 102

Patent

active

059460865

ABSTRACT:
A mean optical power controller that controls power using a voltage controlled optical attenuator (VCOA) is disclosed. This controller uses a control loop in which a signal indicative of the present optical power level is compared to a signal indicative of the desired optical power level, with the difference then being used as input into the VCOA. This controller generates the required variety of signals indicative of the desired optical power level, or reference signals, without having to rely on a CPU. It does this by storing in a local storage means the voltage-values of the reference signals required to realize each supported user-defined optical power level. During the operation of the controller, the voltage-value corresponding to each selected power-level is passed to one or more DACs, where it is converted into a reference signal. A plurality of DACs can be used, which each convert a fraction of each voltage-value, so as to implement a logarithmic relation between the user-defined power levels and the voltage-values. This provides fine control over the optical power level, over a sufficiently large range of values.

REFERENCES:
patent: 4927266 (1990-05-01), Sugiura et al.

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