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Related Concept Videos

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:

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Related Experiment Video

Updated: Jun 22, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Reflective SOA re-modulated 20 Gbit/s RZ-DQPSK over distributed Raman amplified 80 km long reach PON link.

Jesper B Jensen, Idelfonso T Monroy, Rasmus Kjær

    Optics Express
    |June 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates an 80 km bidirectional long-reach passive optical network (PON) using Raman amplification. It successfully transmitted high-speed downstream and upstream signals error-free without needing EDFAs.

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    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

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    Last Updated: Jun 22, 2026

    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    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

    Area of Science:

    • Optical Communications
    • Fiber Optic Networks
    • Signal Processing

    Background:

    • Passive Optical Networks (PONs) are crucial for broadband access.
    • Extending PON reach is vital for cost-effective network expansion.
    • Raman amplification offers a solution for long-haul optical signal boosting.

    Purpose of the Study:

    • To demonstrate an 80 km bidirectional Raman-amplified PON.
    • To evaluate the feasibility of transmitting high-speed signals over long distances in a PON.
    • To assess error-free performance without employing Erbium-Doped Fiber Amplifiers (EDFAs).

    Main Methods:

    • Implemented an 80 km bidirectional PON link.
    • Utilized Raman amplification for signal boosting.
    • Transmitted a 20 Gbit/s RZ-DQPSK downstream signal.
    • Employed an RSOA for ASK-remodulation of the upstream signal at 1.25 Gbit/s.
    • Performed bidirectional transmission within the same fiber.

    Main Results:

    • Achieved error-free transmission for both downstream and upstream signals.
    • Demonstrated successful operation over an 80 km link.
    • Confirmed the effectiveness of Raman amplification in this long-reach PON.
    • Showcased signal integrity without the use of EDFAs.

    Conclusions:

    • An 80 km bidirectional Raman-amplified PON is feasible.
    • High-speed data transmission is achievable over extended PON links.
    • Raman amplification provides a viable alternative to EDFAs for long-reach PONs.