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Related Concept Videos

Small-Signal Analysis of BJT Amplifiers01:21

Small-Signal Analysis of BJT Amplifiers

Small signal analysis is a fundamental approach used in electronics to understand how a Bipolar Junction Transistor (BJT) amplifier processes signals. In the active region, the BJT is designed for linear amplification. The transistor's behavior under these conditions is governed by its instantaneous base-emitter voltage VBE, a sum of the DC bias VBE, and a small AC signal VBE, resulting in the collector current iC. Here, the collector current has a DC component and an AC component.
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
BJT Amplifiers01:14

BJT Amplifiers

Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role extends...

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Simplified ASE correction algorithm for variable gain-flattened erbium-doped fiber amplifier.

Mohd Adzir Mahdi1, Shou-Jong Sheih, Faisal Rafiq Mahamd Adikan

  • 1Wireless and Photonics Networks Research Center, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia. adzir@ieee.org

Optics Express
|June 10, 2009
PubMed
Summary

A new algorithm accurately measures amplified spontaneous emission (ASE) in Erbium-doped fiber amplifiers (EDFAs). This method corrects gain underestimation, reducing errors to under 0.15 dB for precise amplifier performance.

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Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

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Last Updated: Jun 22, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Area of Science:

  • Optical Engineering
  • Telecommunications
  • Fiber Optics

Background:

  • Erbium-doped fiber amplifiers (EDFAs) are crucial for optical signal amplification.
  • Amplified spontaneous emission (ASE) in EDFAs introduces noise and affects gain accuracy.
  • Accurate gain measurement is essential for reliable optical network performance.

Purpose of the Study:

  • To develop a simplified algorithm for quantifying amplified spontaneous emission (ASE) in variable gain-flattened Erbium-doped fiber amplifiers (EDFAs).
  • To address the underestimation of gain values caused by the inability of photodetectors to differentiate signal from ASE.
  • To improve the accuracy of gain level determination in EDFAs.

Main Methods:

  • Developed a simplified algorithm to isolate and quantify the contribution of ASE.
  • Analyzed signal power at both input and output ports of the EDFA.
  • Calculated the average gain penalty across the dynamic gain range.

Main Results:

  • The algorithm accurately manifests the contribution of ASE in variable gain-flattened EDFAs.
  • Gain underestimation errors were significantly reduced to less than 0.15 dB.
  • The method is effective for desired gain values ranging from 15 dB to 30 dB.

Conclusions:

  • The proposed simplified algorithm provides accurate gain level measurements in EDFAs by accounting for ASE.
  • Implementing this algorithm ensures precise control over amplifier output power, enhancing optical network reliability.
  • This technique is vital for optimizing the performance of modern fiber optic communication systems.