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Basic three types of optical attenuator are there: the continuously variable attenuator, step-wise attenuator, and the fixed attenuator. By specific amount, Fixed attenuators reduce light signals with no or negligible reflection. Fixed attenuators are known for more accurate data transmission because signal reflection is not an issue. The voltage standing wave ratio, range, flatness over a particular frequency, peak and average power-handling capability, attenuation amount, size, performance over a particular temperature, and height are included in crucial elements associated with fixed attenuators. To enhance interstage matching in an electronic circuit, fixed attenuators are also often used.
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