{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/79681"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/79681","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Test of Light Speed Constancy With Light Age Using an Active Fiber-Based Mach-Zehnder Interferometer","abstract":"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","abstract_html":"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","abstract_has_math":false,"creators":["Dong, Bo"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Electrical and Computer Engineering","degree_department":"Electrical and Computer Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Wang, Anbo"],"committee_members":["Brown, Gary S.","Pickrell, Gary R."],"year":2006,"date_issued":"2006-05-10","date_published":"2006-05-10","updated_at":"2026-07-22T22:19:16Z","subjects":["Speed of Light","Light Age","Constancy","Fiber","Mach-Zehnder","Interferometer"],"languages":["en_US"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-05222006-122705"],"render_values":[{"text":"etd-05222006-122705","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/79681","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Wang, Anbo"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Brown, Gary S.","Pickrell, Gary R."]},{"key":"dc:contributor.department","label":"Department","values":["Electrical and Computer Engineering"]},{"key":"dc:creator","label":"Author","values":["Dong, Bo"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2017-10-18T04:18:12Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2017-10-18T04:18:12Z","2006-07-11"]},{"key":"dc:date.issued","label":"Date","values":["2006-05-10"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical and Computer Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Speed of Light","Light Age","Constancy","Fiber","Mach-Zehnder","Interferometer"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-05222006-122705"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/79681"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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"]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:title","label":"Title","values":["Test of Light Speed Constancy With Light Age Using an Active Fiber-Based Mach-Zehnder Interferometer"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Wang, Anbo"],"dc:contributor.committeemember":["Brown, Gary S.","Pickrell, Gary R."],"dc:contributor.department":["Electrical and Computer Engineering"],"dc:creator":["Dong, Bo"],"dc:date.accessioned":["2017-10-18T04:18:12Z"],"dc:date.available":["2017-10-18T04:18:12Z","2006-07-11"],"dc:date.issued":["2006-05-10"],"dc:description.abstract":["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"],"dc:description.degree":["Master of Science"],"dc:identifier.other":["etd-05222006-122705"],"dc:identifier.uri":["http://hdl.handle.net/10919/79681"],"dc:language.iso":["en_US"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["Speed of Light","Light Age","Constancy","Fiber","Mach-Zehnder","Interferometer"],"dc:title":["Test of Light Speed Constancy With Light Age Using an Active Fiber-Based Mach-Zehnder Interferometer"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Electrical and Computer Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:19:16Z"}