What is the responsivity of the photodiode?
What is the responsivity of the photodiode?
In the specific case of a photodetector, it measures the electrical output per optical input. A photodetector’s responsivity is usually expressed in units of amperes or volts per watt of incident radiant power. , the wavelength of the optical signal, and has units of amperes per watt (A/W).
How is responsivity of photodiode calculated?
where h ν is the photon energy, η is the quantum efficiency, and e the elementary charge. For example, a silicon photodiode with 90% quantum efficiency at a wavelength of 800 nm, the responsivity would be ≈ 0.58 A/W. Values for other types of photodiode are basically always of that order of magnitude.
Why silicon is not used in photodiode?
Basic considerations in the design of silicon photodiodes for desired performance characteristics will be discussed. Various parameters used to characterize photodiodes will be introduced.
Is photodiode a temperature sensor?
Si and InGaAs photodetectors have been widely used as high temperature sensors in radiation thermometry with a working wavelength of 0.9 μm and 1.6 μm, respectively.
What is responsivity in optical fiber?
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 does responsivity increase with wavelength?
With the increase of wavelength, the energy per photon becomes smaller, and each photon is still able to generate a carrier but with a lower energy. Therefore the responsivity becomes higher at longer wavelengths.
How does photodiode detect light?
A photodiode is a PN-junction diode that consumes light energy to produce an electric current. Sometimes it is also called a photo-detector, a light detector, and photo-sensor. This diode is very sensitive to light so when light falls on the diode it easily changes light into an electric current.
How do you get responsivity?
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.
How is responsivity related to wavelength?
It is interesting to note that the responsivity is linearly proportional to the wavelength of the optical signal. With the increase of wavelength, the energy per photon becomes smaller, and each photon is still able to generate a carrier but with a lower energy.
What is the responsivity of silicon photodiode?
Photodiode Responsivity | Definition, equation, calculator. Definition : The responsivity of silicon photodiode is a measure of sensitivity to light. It is defined as ratio of photocurrent (I p) to incident light power P at given wavelength. In other words, it is measure of the effectiveness of conversion of light power into electric current.
What are the characteristics of photodiode?
TEMPERATURE EFFECTS All photodiode characteristics are affected by changes in temperature. They include shunt resistance, dark current, breakdown voltage, responsivity and to a lesser extent other parameters such as junction capacitance.
What are the factors affecting photodiode responsivity?
It varies with the wavelength of incident light, applied reverse bias and temperature. Following Photodiode Responsivity formula is used in this calculator on Photodiode Responsivity. Following is the list of useful converters and calculators.
What is the saturation limit of a photodiode?
Photodiode Response Incident Power (mW) Saturation Limit 1E-6 1E-5 1E-4 1E-3 0.01 1E-8 1E-7 1E-6 )1E-5 Incident Power (mW) Noise Floor Figure 1: Measured silicon photodiode FDS100 response showing the noise floor and saturation limit for a 5 V bias and 10 kΩload resistor. Background
