Describe the operation of an optical detector

Describe the operation of an optical detector
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1 Answer

Answer :

It is a transducer that converts an optical signal into an electrical  signal. It does this by generating an electrical current proportional to  the intensity of incident optical radiation.
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For efficient operation, should a detector have a high or low responsivity at the operating wavelength?

Description : For efficient operation, should a detector have a high or low responsivity at the operating wavelength?

Last Answer : High.

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Description : Quality fiber-end preparation is essential for proper system operation. What properties must an optical fiber-end face have to ensure proper fiber connection?

Last Answer : Be flat, smooth, and perpendicular to the fiber axis.

Describe an optical fiber cable component (OFCC).

Description : Describe an optical fiber cable component (OFCC).

Last Answer : OFCCs are tight-buffer fiber surrounded by arimid yarn and a low-halogen outer jacket.

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Description : Describe the -3 decibel (dB) optical power frequency (f3dB).

Last Answer : The -3 decibel (dB) is the lowest frequency at which the magnitude of the fiber frequency response has decreased to one half its zero-frequency value.

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Description : Two methods describe how light propagates along an optical fiber. These methods define two theories of light propagation. What do we call these two theories?

Last Answer : The ray theory and the mode theory.

The minimum optical power a light detector can receive and still produce a usable electrical output signal. ∙ A. light responsivity ∙ B. light sensitivity ∙ C. light collectivity ∙ D. illumination

Description : The minimum optical power a light detector can receive and still produce a usable electrical output signal. ∙ A. light responsivity ∙ B. light sensitivity ∙ C. light collectivity ∙ D. illumination

Last Answer : B. light sensitivity

The term responsivity as it applies to a light detector is best described as ∙ A. the time required for the signal to go from 10 to 90 percent of maximum amplitude ∙ B. the ratio of the diode output current to the input optical power ∙ C. the ratio of the input power to output power ∙ D. the ratio of output current to input current

Description : The term responsivity as it applies to a light detector is best described as ∙ A. the time required for the signal to go from 10 to 90 percent of maximum amplitude ∙ B. the ratio of the diode ... . the ratio of the input power to output power ∙ D. the ratio of output current to input current

Last Answer : the ratio of the diode output current to the input optical power

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Description : The three major groups of the optical system are ∙ A. the components, the data rate and the response time ∙ B. the source, the link and the receiver ∙ C. the transmitter, the cable and the receiver ∙ D. the source, the link and the detector

Last Answer : B. the source, the link and the receiver

Which optical detector is used when high sensitivity and bandwidth are required? ∙ a. PMT ∙ b. APD ∙ c. PIN ∙ d. Phototransistor

Description : Which optical detector is used when high sensitivity and bandwidth are required? ∙ a. PMT ∙ b. APD ∙ c. PIN ∙ d. Phototransistor

Last Answer : a. PMT

One of the following is not a solid-state optical detector ∙ a. APD ∙ b. PIN ∙ c. PMT ∙ d. Phototransistors

Description : One of the following is not a solid-state optical detector ∙ a. APD ∙ b. PIN ∙ c. PMT ∙ d. Phototransistors

Last Answer : . PMT

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Description : The minimum optical power a light detector can receive and still produce a usable electrical output signal.

Last Answer : light sensitivity

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Description : Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?

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Description : In the output of an ac error detector, what indicates the (a) direction and (b) amount of control necessary for correspondence?

Last Answer : (a) Phase. (b) Amplitude.

An error signal is the difference between what two quantities fed to the CT (error detector)?

Description : An error signal is the difference between what two quantities fed to the CT (error detector)?

Last Answer : Input signal and feedback.

Why is detector saturation not generally a problem in fiber optic communications systems?

Description : Why is detector saturation not generally a problem in fiber optic communications systems?

Last Answer : Because fiber optic communications systems operate at low optical power levels.

What are the four most common materials used in semiconductor detector fabrication?

Description : What are the four most common materials used in semiconductor detector fabrication?

Last Answer : Silicon, gallium arsenide, germanium, and indium phosphide.

What is the function of the detector?

Description : What is the function of the detector?

Last Answer : To extract the modulating audio signal.

How can a peak detector for pam be modified to detect pdm?

Description : How can a peak detector for pam be modified to detect pdm?

Last Answer : By making the time constant for charging the capacitor at least 10 times the maximum received pulse width.

What is the time constant of the resistor and capacitor in a peak detector for pam?

Description : What is the time constant of the resistor and capacitor in a peak detector for pam?

Last Answer : At least 10 times the interpulse period.

What characteristic of a pulse does a peak detector sample?

Description : What characteristic of a pulse does a peak detector sample?

Last Answer : Pulse amplitude or pulse duration

In its simplest form, what functions must a radar detector be capable of performing?

Description : In its simplest form, what functions must a radar detector be capable of performing?

Last Answer : Detecting the presence of rf energy.

How is a quadrature detector changed when used for phase demodulation?

Description : How is a quadrature detector changed when used for phase demodulation?

Last Answer : The quadrature grid signal is excited by a reference from the transmitter.

Name two advantages of the gated-beam detector.

Description : Name two advantages of the gated-beam detector.

Last Answer : Extreme simplicity, few components, and ease of adjustment.

What condition must exist on both the limiter and quadrature grids for current to flow in a gated-beam detector?

Description : What condition must exist on both the limiter and quadrature grids for current to flow in a gated-beam detector?

Last Answer : Both grids must be positively biased

What circuit functions does the tube in a gated-beam detector serve?

Description : What circuit functions does the tube in a gated-beam detector serve?

Last Answer : Limits, detects, and amplifies.

What is the primary advantage of a ratio detector?

Description : What is the primary advantage of a ratio detector?

Last Answer : Suppresses amplitude noise without limiter stages.

What is the function of an fm detector?

Description : What is the function of an fm detector?

Last Answer : Converting frequency variations of received fm signals to amplitude variations

What is the simplest form of fm detector?

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Last Answer : Slope detector.

which components act as the filter network in the diode detector?

Description : which components act as the filter network in the diode detector?

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To what circuit arrangement is a common-base detector equivalent?

Description : To what circuit arrangement is a common-base detector equivalent?

Last Answer : A diode detector followed by a stage of audio amplification.

Which junction acts as the detector in a common-base detector?

Description : Which junction acts as the detector in a common-base detector?

Last Answer : Emitter-base junction.

How is the output signal developed in the common-emitter detector?

Description : How is the output signal developed in the common-emitter detector?

Last Answer : By the collector current flow through R4.

Which junction of the transistor in the common-emitter detector detects the modulation envelope?

Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?

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Under what circuit conditions would the shunt detector be used?

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Last Answer : The current-diode detector is in parallel with the input and load.

What is the function of the diode in a series-diode detector?

Description : What is the function of the diode in a series-diode detector?

Last Answer : Rectifies the rf pulses in the received signal.

What does the simplest diode detector use to reproduce the modulating frequency?

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Last Answer : The modulation envelope.

What three functions does the transistor in a regenerative detector serve?

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Last Answer : Oscillator, mixer, and detector.

What simple, one-transistor detector circuit uses the heterodyne principle?

Description : What simple, one-transistor detector circuit uses the heterodyne principle?

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Description : The field arrangements in waveguides are divided into what two categories to describe the various modes of operation?

Last Answer : Transverse electric (TE) and transverse magnetic (TM).

Explain operation of balanced slope detector with „s‟ curve.

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Last Answer : Diagram: Explanation:   Curve:  

Draw & explain operation of phase detector.

Description : Draw & explain operation of phase detector.

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Last Answer : T-coupler

Which type of fiber optic connector (butt-jointed or expanded beam) brings the prepared ends of two optical fibers into close contact?

Description : Which type of fiber optic connector (butt-jointed or expanded beam) brings the prepared ends of two optical fibers into close contact?

Last Answer : Butt-jointed connectors.

What is the basic fiber cleaving technique for preparing optical fibers for coupling?

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Last Answer : Score-and-break.

Which type of optical source tends to operate at higher drive currents to produce light?

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Which type of optical source usually lacks reflective facets and in some cases are designed to suppress reflections back into the active region?

Description : Which type of optical source usually lacks reflective facets and in some cases are designed to suppress reflections back into the active region?

Last Answer : LED.

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Description : Which types of LEDs are the preferred optical sources for short-distance, low-data-rate fiber optic systems?

Last Answer : SLEDs and ELEDs.

Define the loss in optical power through a connection.

Description : Define the loss in optical power through a connection.

Last Answer : loss = 10log