A noise-gated PLL for clock recovery in a free-space laser communication system

In this thesis, I developed a phase-locked loop system for data clock recovery in a free-space laser communication application. The clock recovery unit is designed to operate at extremely low optical received power, tolerate a fading channel, and also account for Doppler effects. I explored the feasibility of adding a noise-gating system to the clock recovery unit in order to improve link margin in low-data-rate scenarios. I measured key system performance metrics, such as bandwidth, rejection, lock range and phase noise, and tested system integration with the existing optical communications testbed.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2012

Author dc:creator

• Lund, Gavin

Advisor dc:contributor.advisor

• James K. Roberge and Robert J. Murphy.

• Electrical Engineering and Computer Science.

Statement 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.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/77440

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/77440