Zero reverse bias meaning

[jonnybgood]

What is meant by zero reverse bias? I read it in a datasheet for photodiodes.

 

[vyomax]

I think it terms for using in photovoltic mode.
in which there is zero reverse bias applied to photo diode for producing voltages rather than reverse current.

 

[keith1200rs]

I believe they are intended for current mode use but with no reverse bias voltage. Often photodiodes are reverse biased and used as a current source for speed but large area photodiodes can have a high leakage at anything other than zero reverse bias so you don't reverse bias the but still use them as a current source. I have done that in the past for fluoroscopy with 25mm square photodiodes. Look at the reverse current versus voltage graphs and you should get the idea.

Keith

 

[jonnybgood]

Thanks keith, here's another one for you since you're fmailiar with the subject

I've looked for the ND filter and found that it is a neutral density filter used a lot in photography to attenuate the whole spectrum evenly.

I am a little bit unsure of the refl. graph. Is it refering to reflective ND filter? I what I read is the that refl nd filter is a mild version of ND filter..