How To Choose A Photodetector Video

Subtitles in the video

Due to the photodetector chip material

Parameters such as the size of the photosensitive surface and bandwidth are different

This led to a wide variety of photodetectors

Even if the chip parameters are the same

Packages may also vary

The peripheral circuits in the stack are also different from each manufacturer

Multiple parameter combination

Put on the market

There are hundreds of them

Different photodetector modules

So let's just pick one of these detectors

It can meet our application needs

The answer is no

We need to follow our own application

Choose the right photodetector

To get a good output effect

In that way

How to choose a suitable photodetector

Before choosing a photodetector

You need to determine these core parameters

Wavelength of light

The input mode of light

The bandwidth required to detect the optical signal

The amount of light power entering the detector

The wavelength of light

In your application

How many nanometers is the wavelength of light that needs to be detected

It depends on the light source of your probe

If the wavelength of light is in the 300-1,100 nanometers range

So we have a choice Silicon photodetector

If the wavelength is in the 1,000-1,700 nanometers range

then choose the InGaAs material.

Select the input method that should deepen the material

There are two ways to input a photodetector

One is fiber optic input

One is spatial light input

The concept of required bandwidth is not well understood

You can simply think of it as

How fast your light waves are changing

Or by the bandwidth and rise time formula Work out

The light power entering the detector

If it's a fiber optic input

We can measure this with an optical power meter

If it's a spatial light input

You happen to have no measuring equipment for optical power

That can only be a rough assessment

Do the math

How much light power is going into the detector

After calculating the amount of light power entering the detector

Pick out light power at minimum

And the detector between saturation power

If you still don't understand

You can add our technical support Mr Huang Email: hqy@ybphotonics.com

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