Sökning: "Fiber-optical communication"

Visar resultat 21 - 25 av 27 avhandlingar innehållade orden Fiber-optical communication.

  1. 21. Optical Transmission Systems Based on Phase-Sensitive Amplifiers

    Författare :Samuel L I Olsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optical injection locking; fiber nonlinearities; optical fiber communication; fiber nonlinearity mitigation; four-wave mixing; fiber optic parametric amplification; low-noise amplification; phase-sensitive amplification; fibre optics;

    Sammanfattning : The capacity and reach of today's long-haul fiber optical communication systems is limited by amplifier noise and fiber nonlinearities. Conventional, phase-insensitiveamplifiers (PIAs), have a quantum limited noise figure (NF) of 3 dB at high gain, meaning that with a shot-noise limited input signal the signal-to-noise ratio (SNR)is degraded by at least 3 dB. LÄS MER

  3. 22. Low Cost Remote Antenna Units in CMOS for Fiber-fed Distributed MIMO Systems

    Författare :Waqas Ahmad; Institutionen för elektro- och informationsteknik; []
    Nyckelord :Remote Antenna Unit; distributed MIMO systems; CMOS technology; power amplifier; linearization; CMOS photodiodes; transimpedance amplifier; radio over fiber; optical communication;

    Sammanfattning : Massive multiple input multiple output (MIMO) is a revolutionary communication technique, where large numbers of antennas are employed at the base stations to increase the spectral efficiency, reliability and data rate of the system. Moreover, in multi-user MIMO (MU-MIMO) multiple users can be served by the base stations on the same time-frequency resource. LÄS MER

  4. 23. Study of physical layer impairments in high speed optical networks

    Författare :Mohsan Niaz Chughtai; Lena Wosinska; Richard Schatz; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The work done in this thesis focuses on the impact of transmission impairments in high speed optical networks. Specifically it focuses on the impact of nonlinear impairments in long haul fiber optic data transmission. LÄS MER

  5. 24. Ultrahigh Capacity Fiber-Optic Transmission Systems

    Författare :Jonas Hansryd; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The subject of this thesis is ultrahigh capacity optical communication systems. Such systems will use a combination of techniques for dense wavelength-division multiplexing (D-WDM) and ultrahigh speed all-optical time-division multiplexing (O-TDM). LÄS MER

  7. 25. Developments for Improved Performance Vertical-Cavity Surface Emitting Lasers

    Författare :Xingang Yu; Mattias Hammar; Jens A. Tellefsen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The vertical-cavity surface-emitting laser (VCSEL) is a type of laser diode that emits light from the surface of the chip from which it is manufactured rather than from a cleaved edge as so far has been common for most telecommunication lasers. VCSEL’s low cost, high power efficiency and low power consumption properties make it a very attractive signal source for many applications such as fiber optical communication, optical interconnects, 3D sensing, absorption spectroscopy, laser printing, etc. LÄS MER