Optical transmitter and optical transmission system
US6407845B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2001 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/25
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention aims at providing an optical transmitter utilizing a Mach-Zehnder type optical modulator, in which the optical modulator is capable of readily optimizing an optical wavelength chirp to be added to a transmission optical signal. To this end, the optical transmitter of the present invention includes a Mach-Zehnder type optical modulator having two arms driven by two drive signals, respectively, and is constituted to comprise: amplitude adjusting parts for adjusting the amplitudes of the drive signals, respectively; phase adjusting parts for adjusting the phases of the drive signals, respectively; an amplitude controlling part for feedback controlling the amplitude adjusting parts so that an amplitude ratio between the drive signals becomes a value corresponding to an optimum optical wavelength chirp amount; and a phase controlling part for feedback controlling the phase adjusting parts so that the phases of the drive signals are brought into an antiphase relation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.