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.:
Date of Patent:
Apr. 29, 2008
Filed:
Mar. 11, 2003
Pavel V. Mamyshev, Morganville, NJ (US);
Christian J. Rasmussen, Nashua, NH (US);
Benny P. Mikkelsen, Boston, MA (US);
Fenghai Liu, Nashua, NH (US);
Pavel V. Mamyshev, Morganville, NJ (US);
Christian J. Rasmussen, Nashua, NH (US);
Benny P. Mikkelsen, Boston, MA (US);
Fenghai Liu, Nashua, NH (US);
Mintera Corporation, Lowell, MA (US);
Abstract
Different techniques for generating spectrally efficient carrier-suppressed modulated optical signals, also known as 'phase-shaped binary transmission' (PSBT) signals, employ electrical components that generate only 2-level or binary signals, in contrast to techniques that require 3-level electrical drivers. The PSBT modulators can be used with return-to-zero (RZ) modulators for generating RZ-PSBT signals, which have the characteristic of even greater spectral efficiency than NRZ PSBT signals. The technique is generalized to RZ signals with an arbitrary phase difference between pulses. These signals can be generated by shifting the central (carrier) frequency of an RZ modulated optical signal, which can be done using a certain phase modulation or using spectral filtering with a passband offset from the center (carrier) frequency of the modulated optical signal, and the signals can also be generated by phase modulation at a frequency lower than the signaling rate of the modulated signal.