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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 9270381 B1

PDFFull Text
Date of Patent:
Feb. 23, 2016

Filed:

Nov. 22, 2011

Method and apparatus for transmitting and receiving coherent optical ofdm

Applicants:

Chun Ju Youn, Daejeon, KR;

Yong-hwan Kwon, Daejeon, KR;

Duk Jun Kim, Daejeon, KR;

Jong-hoi Kim, Daejeon, KR;

Joong-seon Choe, Daejeon, KR;

Kwang-seong Choi, Daejeon, KR;

Eun Soo Nam, Daejeon, KR;

Inventors:

Chun Ju Youn, Daejeon, KR;

Yong-Hwan Kwon, Daejeon, KR;

Duk Jun Kim, Daejeon, KR;

Jong-Hoi Kim, Daejeon, KR;

Joong-Seon Choe, Daejeon, KR;

Kwang-Seong Choi, Daejeon, KR;

Eun Soo Nam, Daejeon, KR;

Assignee:

ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon, KR;

Attorney:

Rabin & Berdo, P.C.

Primary Examiner:

Ken Vanderpuye

Assistant Examiner:

Mina Shalaby

Int. Cl.
CPC ...
H04B 10/06 (2006.01); H04B 10/04 (2006.01); H04B 10/548 (2013.01); H04B 10/077 (2013.01); H04B 10/588 (2013.01); H04B 10/61 (2013.01); H04L 27/20 (2006.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04B 10/548 (2013.01); H04B 10/0775 (2013.01); H04B 10/588 (2013.01); H04B 10/613 (2013.01); H04B 10/6165 (2013.01); H04L 27/2096 (2013.01); H04L 27/2613 (2013.01); H04L 27/2657 (2013.01); H04L 27/2675 (2013.01); H04L 27/2692 (2013.01); H04L 27/2697 (2013.01);
Abstract

Disclosed are a method and an apparatus for transmitting and receiving coherent optical OFDM. The apparatus includes: a transmitted OFDM digital signal processing unit outputting an in-phase (I) component digital signal and a quadrature phase (Q) component digital signal; a digital-analog converter converting the in-phase (I)-component digital signal and the quadrature-phase (Q)-component digital signal into an in-phase (I)-component analog signal and a quadrature-phase (Q)-component analog signal, respectively; an adder adding an additional pilot tone signal to each of the in-phase (I)-component analog signal and the quadrature-phase (Q)-component analog signal outputted from the digital-analog converter; and an optical I/Q modulator up-converting the in-phase (I)-component analog signal added with the additional pilot tone signal and the quadrature-phase (Q)-component analog signal added with the additional pilot tone signal to an optical domain to output a coherent optical OFDM signal including the additional pilot tone signal.

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