Title page for ETD etd-05222006-122705

Type of Document Master's Thesis
Author Dong, Bo
Author's Email Address bdong@vt.edu
URN etd-05222006-122705
Title Test of Light Speed Constancy With Light Age Using an Active Fiber-Based Mach-Zehnder Interferometer
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wang, Anbo Committee Chair
Brown, Gary S. Committee Member
Pickrell, Gary R. Committee Member
  • Speed of Light
  • Light Age
  • Constancy
  • Fiber
  • Mach-Zehnder
  • Interferometer
Date of Defense 2006-05-10
Availability unrestricted
This thesis investigates the constancy of light speed with respect to the light age using an active fiber-based Mach-Zehnder interferometer (MZI) illuminated by sunlight. The original sunlight in one arm, which has the age of 8.3 minutes since it was emitted from the sun, interferes with the young light generated by stimulated emission from an optical amplifier in the other arm, which is coherent to the sunlight. The speed difference between the sunlight and the newly regenerated light is obtained by measuring the phase variations as the interference signal travels along a span of single-mode fiber. System error is eliminated by the self-calibration which is achieved by alternatively switching other two local amplified spontaneous emission light sources and the sunlight as the input to the MZI, and then comparing the measured phase differences of these three sources. The relative accuracy of light speed measurement is . Consider the 8.3 minutes age of the sunlight, for a possible variation of light speed of c with light age in optical fiber, we obtainĢc/c is less than 1.7
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