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:
Jun. 06, 2000
Filed:
Jun. 13, 1997
Pavel V Mamyshev, Middletown, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
Apparatus and method for generating a return-to-zero (RZ) optical data stream. A laser or other continuous wave (CW) optical source generates an optical carrier signal which is applied to a phase modulator. A return-to-zero data generator multiplies a non-return-to-zero (NRZ) electrical data stream and a sinusoidal electrical signal to generate an RZ electrical data stream. The phase modulator modulates the RZ electrical data stream onto the optical carrier signal to generate a phase-modulated optical signal. A Stokes portion or an anti-Stokes portion of the phase-modulated optical signal spectrum is then spectrally separated in an optical filter to provide a corresponding output RZ optical data stream. The spectral separation may be provided using a discrete filter coupled to the output of the phase modulator, or using transmission line filtering in a soliton transmission system. The use of the phase modulator to perform data encoding operations avoids the modulation bias drift problems inherent in amplitude modulators.