How do you measure responsivity of a photodiode?
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 are the bandwidth and responsivity of the Ingaas photodiode?
The photodiode has a responsivity of 0.35 A/W at room temperature at 2 μm, and a 3 dB bandwidth of 3.7 GHz.
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 responsivity of a photodetector?
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.
What is the difference between sensitivity and responsivity?
As nouns the difference between responsivity and sensitivity is that responsivity is a measure of responsiveness while sensitivity is the quality of being sensitive.
What is responsivity unit?
Units of responsivity are amperes per watts (A W−1) or volts per watts (V W−1). When the definition of the responsivity is expanded to include the frequency dependence and the wavelength (spectral) dependence, the responsivity is known as the spectral responsivity R(λ, f).
How is responsivity measured?
You can measure the responsivity of a silicon photodiode by illuminating the device with a known amount of laser power and then measuring the output voltage developed across a bias resistor. You must first characterize the light sources you will use by measuring the power in the beams.
What is meant by responsivity?
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.
On which factors does the response time of photodiode depends?
The transit time depends on the carrier drift velocity and the depletion layver width w, and is given by: 2- Diffusion time of photocarriers outside depletion region.