{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18570"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18570","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Characterization and comparison of optical source relative intensity noise and effects in optical coherence tomography","abstract":"This thesis research investigates the effects of optical source noise in optical coherence tomography (OCT). While shot noise, thermal noise and relative intensity noise (RIN) (excess photon noise) constitute optical noise, RIN is the least understood and often the most significant factor limiting the sensitivity of an optical system. The existing and prevalent theory being used for estimating RIN for various light sources in OCT is questionable, and cannot be applied uniformly for different types of sources. The origin of noise in various sources varies significantly, owing to the different physical nature of photon generation. In this thesis, RIN of several OCT light sources are characterized and compared. Light sources include a super-luminescent diode (SLD), an erbium-doped fiber amplifier (EDFA), multiplexed SLDs, and a continuous wave (cw) laser. A method for the reduction of RIN by amplifying the SLD light output by using a gain-saturated semiconductor optical amplifier (SOA) is reported. Also, measurements using a time-domain OCT (TD-OCT) system are performed to verify the effects of optical source noise reduction on OCT data. Simulations comparing OCT and ISAM images assuming an identical optical source noise are also performed and explained.","abstract_html":"This thesis research investigates the effects of optical source noise in optical coherence tomography (OCT). While shot noise, thermal noise and relative intensity noise (RIN) (excess photon noise) constitute optical noise, RIN is the least understood and often the most significant factor limiting the sensitivity of an optical system. The existing and prevalent theory being used for estimating RIN for various light sources in OCT is questionable, and cannot be applied uniformly for different types of sources. The origin of noise in various sources varies significantly, owing to the different physical nature of photon generation. In this thesis, RIN of several OCT light sources are characterized and compared. Light sources include a super-luminescent diode (SLD), an erbium-doped fiber amplifier (EDFA), multiplexed SLDs, and a continuous wave (cw) laser. A method for the reduction of RIN by amplifying the SLD light output by using a gain-saturated semiconductor optical amplifier (SOA) is reported. Also, measurements using a time-domain OCT (TD-OCT) system are performed to verify the effects of optical source noise reduction on OCT data. Simulations comparing OCT and ISAM images assuming an identical optical source noise are also performed and explained.","abstract_has_math":false,"creators":["Shin, Sunghwan"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Boppart, Stephen A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-01-21T22:46:54Z","date_published":"2011-01-21T22:46:54Z","updated_at":"2026-07-22T22:25:11Z","subjects":["optical coherence tomography","relative intensity noise"],"languages":["en"],"rights":["Copyright 2010 Sunghwan Shin"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/18570","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Boppart, Stephen A."]},{"key":"dc:creator","label":"Author","values":["Shin, Sunghwan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-01-21T22:46:54Z","2013-01-22T11:00:26Z","2010-12"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["optical coherence tomography","relative intensity noise"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2010 Sunghwan Shin"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/18570"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis research investigates the effects of optical source noise in optical coherence tomography (OCT). 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While shot noise, thermal noise and relative intensity noise (RIN) (excess photon noise) constitute optical noise, RIN is the least understood and often the most significant factor limiting the sensitivity of an optical system. The existing and prevalent theory being used for estimating RIN for various light sources in OCT is questionable, and cannot be applied uniformly for different types of sources. The origin of noise in various sources varies significantly, owing to the different physical nature of photon generation. In this thesis, RIN of several OCT light sources are characterized and compared. Light sources include a super-luminescent diode (SLD), an erbium-doped fiber amplifier (EDFA), multiplexed SLDs, and a continuous wave (cw) laser. A method for the reduction of RIN by amplifying the SLD light output by using a gain-saturated semiconductor optical amplifier (SOA) is reported. 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