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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9264147 B1

PDFFull Text
Date of Patent:
Feb. 16, 2016

Filed:

Mar. 24, 2011

Method and apparatus for phase shift keyed optical communications

Applicants:

David O. Caplan, Westford, MA (US);

Neal W. Spellmeyer, Arlington, MA (US);

Bryan S. Robinson, Arlington, MA (US);

Scott A. Hamilton, Lexington, MA (US);

Don M. Boroson, Needham, MA (US);

Hemonth G. Rao, Bedford, MA (US);

Marc C. Norvig, Melrose, MA (US);

Inventors:

David O. Caplan, Westford, MA (US);

Neal W. Spellmeyer, Arlington, MA (US);

Bryan S. Robinson, Arlington, MA (US);

Scott A. Hamilton, Lexington, MA (US);

Don M. Boroson, Needham, MA (US);

Hemonth G. Rao, Bedford, MA (US);

Marc C. Norvig, Melrose, MA (US);

Assignee:

Massachusetts Institute of Technology, Cambridge, MA (US);

Attorney:

Hamilton, Brook, Smith & Reynolds, P.C.

Primary Examiner:

Daniel Dobson

Int. Cl.
CPC ...
H04B 10/00 (2013.01); H04B 10/67 (2013.01); H04B 10/556 (2013.01); H04L 27/20 (2006.01); H04L 27/22 (2006.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04B 10/677 (2013.01); H04B 10/5561 (2013.01); H04L 27/2075 (2013.01); H04L 27/2096 (2013.01); H04L 27/223 (2013.01); H04L 27/2601 (2013.01);
Abstract

A burst-mode phase shift keying (PSK) communications system according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. Embodiments may operate on differential PSK (DPSK) signals. An embodiment of the system utilizes a single interferometer in the receiver with a relative path delay that is matched to the DPSK symbol rate of the link. DPSK symbols are transmitted in bursts, and the data rate may be varied by changing the ratio of the burst-on time to the burst-off time. This approach offers a number of advantages over conventional DPSK implementations, including near-optimum photon efficiency over a wide range of data rates, simplified multi-rate transceiver implementation, and relaxed transmit laser line-width requirements at low data rates.

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