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A student designed a power meter circuit to measure optical power for a fiber-optic link operating at A of 1.55µm. The student used an InGaAs photodiode and the biasing circuit was shown below, where lo is the photocurrent. Assume that la =a-Pz where a ( photodiode sensitivity) is Ima/1mw of optical power. The only design parameters in the circuit are Vdd and R. The student did not have the option to use another InGaAs photodiode with higher sensitivity. Vad = 10 V lo O $ V, = 0.5V R1 = 2 ko (a) Use the ON/OFF model for the InGaAs diode (Vf = 0.5 Volt, not 0.7 Volt) to calculate output voltage Vo for la of 1 mA, 2 mA, 5 mA, and 10 mA.

A student designed a power meter circuit to measure optical power for a fiber-optic link operating at A of 1.55µm. The student used an InGaAs photodiode and the biasing circuit was shown below, where lo is the photocurrent. Assume that la =a-Pz where a ( photodiode sensitivity) is Ima/1mw of optical power. The only design parameters in the circuit are Vdd and R. The student did not have the option to use another InGaAs photodiode with higher sensitivity. Vad = 10 V lo O $ V, = 0.5V R1 = 2 ko (a) Use the ON/OFF model for the InGaAs diode (Vf = 0.5 Volt, not 0.7 Volt) to calculate output voltage Vo for la of 1 mA, 2 mA, 5 mA, and 10 mA.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A student designed a power meter circuit to measure optical power for a fiber-optic link operating at A of 1.55pm. The student used an InGaAs photodiode and the biasing circuit was shown below, where /, is the photocurrent. Assume that lo = a-P, where a ( photodiode sensitivity) is 1mA/1mW of optical power. The only design parameters in the circuit are Vdd and R. The student did not have the option to use another InGaAs photodiode with higher sensitivity. Vaa = 10 V lo O $ v, = 0.5V RL = 2 ka (a) Use the ON/OFF model for the InGaAs diode (Vf = 0.5 Volt, not 0.7 Volt) to calculate output voltage Vo for l, of 1 mA, 2 mA, 5 mA, and 10 mA.
Transcribed Image Text:A student designed a power meter circuit to measure optical power for a fiber-optic link operating at A of 1.55pm. The student used an InGaAs photodiode and the biasing circuit was shown below, where /, is the photocurrent. Assume that lo = a-P, where a ( photodiode sensitivity) is 1mA/1mW of optical power. The only design parameters in the circuit are Vdd and R. The student did not have the option to use another InGaAs photodiode with higher sensitivity. Vaa = 10 V lo O $ v, = 0.5V RL = 2 ka (a) Use the ON/OFF model for the InGaAs diode (Vf = 0.5 Volt, not 0.7 Volt) to calculate output voltage Vo for l, of 1 mA, 2 mA, 5 mA, and 10 mA.
(b) Based on your data for Vo for l, up to 5mA, what was the power meter's sensitivity in terms of Volt/mW of optical power, P? (c) Determine the maximum optical power (Pmax) below which Vo is proportional to the optical power PL. (d) If the student wanted to increase the power meter's sensitivity, what could he do? (e) If the student wanted to increase Pmax, what could he do?
Transcribed Image Text:(b) Based on your data for Vo for l, up to 5mA, what was the power meter's sensitivity in terms of Volt/mW of optical power, P? (c) Determine the maximum optical power (Pmax) below which Vo is proportional to the optical power PL. (d) If the student wanted to increase the power meter's sensitivity, what could he do? (e) If the student wanted to increase Pmax, what could he do?
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