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Related Concept Videos

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...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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...

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Related Experiment Video

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

Noise suppression using optimum filtering of OCs generated by a multiport encoder/decoder.

Takahiro Kodama1, Naoya Wada, Gabriella Cincotti

  • 1Department of Electrical Electronic, and Information Engineering, Osaka University, 565-0871 Osaka, Japan. kodama@pn.comm.eng.osaka-u.ac.jp

Optics Express
|April 27, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new receiver using an extreme narrow band-optical band pass filter to reduce interference and noise in optical code division multiplexing systems. This allows doubling users in passive optical networks without error correction.

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Area of Science:

  • Optical Communications
  • Signal Processing

Background:

  • Optical Code Division Multiplexing (OCDM) systems face limitations due to multiple access interference (MAI) and beat noises.
  • Increasing user capacity in Passive Optical Networks (PONs) is crucial for network expansion.

Purpose of the Study:

  • To propose and validate a novel receiver configuration for OCDM systems.
  • To mitigate MAI and beat noises.
  • To enhance code detectability and increase user capacity in PONs.

Main Methods:

  • Utilized an extreme narrow band-optical band pass filter (ENB-OBPF) in the receiver design.
  • Conducted numerical simulations to evaluate the proposed configuration.
  • Performed experimental validation of the system's performance.

Main Results:

  • Demonstrated significant reduction in MAI and beat noises.
  • Achieved enhanced code detectability.
  • Successfully increased the number of users in a PON from 4 to 8 without Forward Error Correction (FEC).

Conclusions:

  • The proposed ENB-OBPF receiver configuration is effective in suppressing interference and noise in OCDM.
  • The enhanced code detectability enables a higher user count in PONs, offering a cost-effective solution.