EE 118. Introduction to Optical Communication Systems


Course objectives: This course introduces the basic concepts required to understand optical communication systems and networks. Theory, applications, and design principles are emphasized.

Topics Covered (course outline)

  • Introduction ¿ Communications, electronics, and electromagnetic fields; realizing the potential of light in communications and networking to overcome channel capacity limitations; uses and general configurations of optical communication channels and networks; electromagnetic propagation parameters, wavelength, diffraction, line width, and coherence; characterization of loss and dispersion
  • Basic Limitation Imposed on Communication Systems ¿ Analog and digital communications; sampling, encoding, modulation schemes; error correction and compression; Shannon¿s formula; channel capacity; measurement of coherence and its relationship to frequency content and its influence on communication channel limitations; probability (binomial, Poisson, and Gaussian distributions); Central Limit Theorem; thermal vs. coherent radiation; photon distributions; basic noise sources: shot, thermal, quantum
  • Communication Systems ¿ Free space vs. guided wave communications; uses and types of repeaters (optoelectronic and all-optical); networks; analog vs. digital systems; direct detection vs. heterodyne systems; multichannel vs. single-channel systems; multiplexing schemes (principally, CDM, TDM, WDM)
  • Receiving Devices and Preamplifiers ¿ Optoelectronic receivers; signal-to-noise ratio; bit error rate calculations; sources of noise; eye diagram; detection (principally, APD and the pin diode); basic principles of optoelectronic receivers; transimpedance configuration; quantum amplifiers (gain, noise, anti-reflection coating) and oscillators
  • General Principles of Optical Fiber Communications ¿ Digital systems vs. basic analog systems; bandwidth and data rate and their relation to modulation formats; coherent optical communications schemes (homodyne, heterodyne, balanced mixer); power and rise-time budget calculations; comparison with microwave communication channels
  • Modulation Principles ¿ Direct modulation of optical sources; external modulation (couplers and switches); electro-optic modulation; acousto-optic modulation; various waveguide modulators (electro-absorption and electro-refraction); array waveguide grating principles and applications
  • Essentials of the Transmission Channel ¿ Attenuation in fibers; dispersion and optimum wavelength in operation; standards allocations of wavelengths (frequencies) in fiber systems; modes of propagation and polarization
  • Fiber Optic Networks ¿ General topologies; FDDI networks; synchronous optical networks; multiplexing in networks
  • Related Topics (as time permits) ¿ Integrated optics and optoelectronic integrated circuits; optical signal processing and Fourier transform properties of a lens; other optical systems (e.g., bar code readers, laser discs); fiber sensors; Doppler and pulsed optical radar principles

General Catalog