{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/83831"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/83831","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Experimental designs for efficient free-space multi-spatial-mode optical communication","abstract":"In optical communications, two measures of efficiency are commonly at odds. The first is the photon information efficiency (in bits/photon) which measures the information that each detected photon conveys; the second is the spectral efficiency (in bits/s/Hz) which measures the bit rate achieved under limited bandwidth. One interesting communication protocol which can simultaneously obtain high information efficiency without sacrificing spectral efficiency, however, is spatial pulse-position- modulation (spatial-PPM), in which information is encoded into the spatial modes of light and sent through free space between transmitter and receiver. This thesis aims to lay the groundwork for an experimental design to achieve efficient spatial-PPM free-space optical communication using 1550 nm light at the single photon level. We focus on presenting and evaluating a transmitter-receiver design by giving a precise characterization of its operation, properties, and limitations.","abstract_html":"In optical communications, two measures of efficiency are commonly at odds. The first is the photon information efficiency (in bits/photon) which measures the information that each detected photon conveys; the second is the spectral efficiency (in bits/s/Hz) which measures the bit rate achieved under limited bandwidth. One interesting communication protocol which can simultaneously obtain high information efficiency without sacrificing spectral efficiency, however, is spatial pulse-position- modulation (spatial-PPM), in which information is encoded into the spatial modes of light and sent through free space between transmitter and receiver. This thesis aims to lay the groundwork for an experimental design to achieve efficient spatial-PPM free-space optical communication using 1550 nm light at the single photon level. We focus on presenting and evaluating a transmitter-receiver design by giving a precise characterization of its operation, properties, and limitations.","abstract_has_math":false,"creators":["Ng, Edwin, S.B. Massachusetts Institute of Technology"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Physics.","school":null,"contributors":[],"advisors":["Franco N.C. Wong."],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013","date_published":"2013","updated_at":"2026-07-22T22:22:29Z","subjects":["Physics."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/83831","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Franco N.C. Wong."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/83831"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.","Cataloged from PDF version of thesis.","Includes bibliographical references (page 77)."]},{"key":"dc:description.abstract","label":"Abstract","values":["In optical communications, two measures of efficiency are commonly at odds. The first is the photon information efficiency (in bits/photon) which measures the information that each detected photon conveys; the second is the spectral efficiency (in bits/s/Hz) which measures the bit rate achieved under limited bandwidth. One interesting communication protocol which can simultaneously obtain high information efficiency without sacrificing spectral efficiency, however, is spatial pulse-position- modulation (spatial-PPM), in which information is encoded into the spatial modes of light and sent through free space between transmitter and receiver. This thesis aims to lay the groundwork for an experimental design to achieve efficient spatial-PPM free-space optical communication using 1550 nm light at the single photon level. We focus on presenting and evaluating a transmitter-receiver design by giving a precise characterization of its operation, properties, and limitations."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.B."]},{"key":"dc:title","label":"Title","values":["Experimental designs for efficient free-space multi-spatial-mode optical communication"]}]}],"canonical_facts":{"dc:contributor.advisor":["Franco N.C. Wong."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Physics."],"dc:contributor.other":["Massachusetts Institute of Technology. Department of Physics."],"dc:creator":["Ng, Edwin, S.B. Massachusetts Institute of Technology"],"dc:date.accessioned":["2014-01-09T19:59:49Z"],"dc:date.available":["2014-01-09T19:59:49Z"],"dc:date.issued":["2013"],"dc:description":["Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.","Cataloged from PDF version of thesis.","Includes bibliographical references (page 77)."],"dc:description.abstract":["In optical communications, two measures of efficiency are commonly at odds. The first is the photon information efficiency (in bits/photon) which measures the information that each detected photon conveys; the second is the spectral efficiency (in bits/s/Hz) which measures the bit rate achieved under limited bandwidth. One interesting communication protocol which can simultaneously obtain high information efficiency without sacrificing spectral efficiency, however, is spatial pulse-position- modulation (spatial-PPM), in which information is encoded into the spatial modes of light and sent through free space between transmitter and receiver. This thesis aims to lay the groundwork for an experimental design to achieve efficient spatial-PPM free-space optical communication using 1550 nm light at the single photon level. We focus on presenting and evaluating a transmitter-receiver design by giving a precise characterization of its operation, properties, and limitations."],"dc:description.degree":["S.B."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/83831"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Physics."],"dc:title":["Experimental designs for efficient free-space multi-spatial-mode optical communication"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:22:29Z"}