What is photodiode responsivity?

What is photodiode responsivity?

The responsivity (or radiant sensitivity) of a photodiode or some other kind of photodetector is the ratio of generated photocurrent and incident (or sometimes absorbed) optical power (neglecting noise influences), determined in the linear region of response.

What is the responsivity of a light detector?

Responsivity is defined as the output signal (typically voltage or current) of the detector produced in response to a given incident radiant power falling on the detector.

What is fiber optic responsivity?

Responsivity is the ratio of electrical output from the detector to the input optical power. If the output current varies proportionally to the input, this is measured as amps per watt (A/W).

Why photodiode is heavily doped?

The intrinsic layer is placed between the p region and n region to increase the width of depletion region. The p-type and n-type semiconductors are heavily doped. Therefore, the p region and n region of the PIN photodiode has large number of charge carriers to carry electric current.

How is responsivity calculated?

You need to know the spectral irradiance which is the incident irradiation power per wavelength interval at the different wavelength of the measurement range. Assuming this power is P(lambda) watt/ um , Then you obtain the responsivity by dividing the total current to the total power.

What is responsivity photo detector?

Photodetector responsivity (defined by Equation 1.2. 2 in Chapter 1) is a measure of optical-to-electrical conversion efficiency of a photodetector and is usually expressed by the value of the photocurrent (mA) generated by each milliwatt of optical signal.

How is Detectivity measured?

The specific detectivity D* is the detectivity normalized to a unit detector area (1 m2) and detection bandwidth (1 Hz); one can calculate it by multiplying the detectivity with the square root of the product of detector area (in square centimeters) and the detector bandwidth (in Hz).

How do you calculate the power of a photodiode?

Calculate the incident optical power required to operate photo current of 2.5 µA when the photodiode is operating as above.

1. Ep=1.5×10−19J.
2. Ip=2.5µA.
3. Incident optical power Pin.
4. hν=Ep and ν=cλ
5. λ=hcEp=6.62×10−34.3×1081.5×10−19=0.21µm.
6. ∴λ=1.324 µm.
7. R=ɳqhν=ɳqEp=0.65×1.6×10−191.5×10−19=0.69.
8. R=IpPin=2.5×10−6Pin=0.69.

What is the responsivity of a radiant detector?

Responsivity is defined as the output signal (typically voltage or current) of the detector produced in response to a given incident radiant power falling on the detector. Using the definition of external QE, the responsivity is determined as where h ν is the energy of incident photons.

How to determine the power responsivity of a photon detector?

The power responsivity of a photon detector can be determined with the use of a blackbody source by the following procedure: 1.

What is responsivity of an IR detector?

Responsivity does not take into account the level of total intrinsic noise in the detector. In other words, an IR detector with high responsivity is not necessarily able to detect low-level IR radiation or to distinguish IR sources of nearly the same intensity.

What is the responseresponsivity of the detector?

Responsivity is the detector output per unit of input power in amperes/watt or volts/watt, depending on whether the output is an electric current or a voltage. From: Principles of Colour and Appearance Measurement, 2014.