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Quasicontinuous tunable fiber-ring laser applied as local oscillator in an absolute calibrated spectrometer for WDM systems

: Kruger, U.; Kruger, K.; Helmolt, C. von


Journal of Lightwave Technology 15 (1997), No.4, pp.628-35
ISSN: 0733-8724
Journal Article
Fraunhofer HHI ()
calibration; fabry-perot resonators; fibre lasers; laser frequency stability; laser tuning; measurement errors; optical communication equipment; optical transmitters; ring lasers; spectrometer accessories; spectrometers; wavelength division multiplexing; quasicontinuous tunable fiber-ring laser; local oscillator; absolute calibrated spectrometer; wdm systems; tunable fiber-ring laser; calibrated optical spectrometer; transmitters; wavelet division multiplexing; wdm; fiber ring laser; high finesse fabry-perot resonator; high free spectral range; dispersion shifted fiber; high wavelength determination accuracy; auxiliary signals; krypton filled absorption tube; periodical filter; absolute frequency accuracy; relative frequency accuracy; 1 km; 1527 to 1562 nm

A special tunable fiber-ring laser is introduced. With this laser as local oscillator, a calibrated optical spectrometer was realized, which allows the determination of the wavelength of all transmitters of a wavelet division multiplexing (WDM) system in one sweep. The system is based on a fiber ring laser including a high finesse Fabry-Perot resonator with a high free spectral range and a 1-km-long dispersion shifted fiber. To achieve a high wavelength determination accuracy two auxiliary signals are generated: one with a Krypton filled absorption tube and another with a simple, silica based, periodical filter. With that, the wavelength of every transmitter of a WDM signal can be determined with an absolute frequency accuracy of better than +or-0.8 GHz in a range of 1527-1562 nm in one sweep. The relative frequency accuracy is better than +or-0.3 GHz.