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Related Concept Videos

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...
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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A multiple star WDM-PON using a band splitting WDM filter.

Sil-Gu Mun1, Sang-Mook Lee, Katsunari Okamoto

  • 1School of Electrical Engineering & Computer Science, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea.

Optics Express
|June 12, 2008
PubMed
Summary

We introduce a novel multiple star wavelength division multiplexing-passive optical network (WDM-PON) architecture. This design simplifies network management and offers a scalable solution for diverse subscriber groups.

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Area of Science:

  • Telecommunications Engineering
  • Optical Networking

Background:

  • Passive Optical Networks (PONs) are crucial for broadband access.
  • Wavelength Division Multiplexing (WDM) enhances capacity in optical networks.
  • Serving widely distributed subscriber groups presents unique architectural challenges.

Purpose of the Study:

  • To propose a novel multiple star WDM-PON architecture.
  • To address the challenge of serving diverse and geographically spread subscriber groups.
  • To simplify network management and enable scalable deployment.

Main Methods:

  • Utilizing a band splitting WDM (BSWDM) filter for upstream and downstream band separation.
  • Assigning distinct sub-bands to different subscriber groups.
  • Employing a single type Arrayed Waveguide Grating (AWG) for second-stage splitting.

Main Results:

  • The proposed architecture enables a color-free outside plant.
  • Management issues are significantly simplified.
  • The design inherently supports a 'pay-as-you-grow' deployment model.

Conclusions:

  • The novel multiple star WDM-PON architecture offers an efficient solution for large-scale deployments.
  • The use of BSWDM filters and standardized AWGs reduces complexity and cost.
  • This approach enhances scalability and manageability in passive optical networks.