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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Related Experiment Video

Updated: Jun 12, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Low-complexity mitigation of multipath interference in PAM-4 IM/DD systems via recursive filtering.

Hum Nath Parajuli, Tonghui Ji, Xinping Wang

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A new low-complexity method effectively mitigates multipath interference (MPI) in high-speed optical systems. This recursive filtering approach significantly reduces bit-error rates (BER) and enhances signal-to-interference ratio (SIR) tolerance.

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    Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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    Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

    Published on: March 13, 2017

    Related Experiment Videos

    Last Updated: Jun 12, 2026

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
    11:54

    Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

    Published on: March 13, 2017

    Area of Science:

    • Optical communication systems
    • Signal processing

    Background:

    • Multipath interference (MPI) degrades high-speed intensity-modulation/direct-detection (IM/DD) systems.
    • Existing digital signal processing (DSP) mitigation techniques often have high computational complexity.

    Purpose of the Study:

    • To propose and validate a low-complexity MPI mitigation method for IM/DD systems.
    • To improve the performance of 32 GBaud PAM-4 systems under various signal-to-interference ratios (SIRs) and laser linewidths.

    Main Methods:

    • A two-stage recursive filtering approach: coarse mitigation for slow fluctuations and fine mitigation for residual distortion.
    • Simulation and experimental validation on 32 GBaud PAM-4 systems.

    Main Results:

    • Substantial bit-error rate (BER) reduction across a wide range of SIRs and laser linewidths.
    • Achieved BERs below the KP4-FEC threshold at an SIR of 22 dB.
    • Improved SIR tolerance by over 8 dB for both broad- and narrow-linewidth lasers.

    Conclusions:

    • The proposed low-complexity recursive filtering method effectively mitigates MPI in high-speed IM/DD systems.
    • Offers superior performance compared to existing digital filtering methods with significantly lower computational cost (4 multiplications, 2 additions, 2 registers per symbol).