Title :
Intermodulation distortion in 48 TV channel FM-FDM optical transmission
Author :
Suto, Ko-ichi ; Yoshinaga, Hisao ; Kokubun, Toshinao ; Kikushima, Koji ; Yoneda, Etsugo
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
Abstract :
The effect of dispersive fibers on multichannel FM video transmission characteristics is experimentally investigated. A directly modulated 1.5 mu m distributed feedback laser diode (DFB-LD) and a LiNbO/sub 3/ external modulator with a continuous-wave (CW) 1.55 mu m DFB-LD are used as optical signal sources. When the 1.3 mu m single-mode fiber (SMF) is used, directly modulated DFB-LDs suffer from second-and third-order intermodulation distortion (IMD). The external modulator realizes good transmission characteristics irrespective of the fiber´s dispersion value. This means that external modulators can realize multichannel FM television signal transmission systems that use the standard 1.3 mu m SMF already installed in fiber optic subscriber loops.<>
Keywords :
frequency division multiplexing; frequency modulation; intermodulation; optical links; optical modulation; video signals; 1.3 micron; 1.55 micron; DFB-LD; FM-FDM optical transmission; LiNbO/sub 3/; TV channel; directly modulated; dispersive fibers; distributed feedback laser; fiber optic subscriber loops; intermodulation distortion; laser diode modulation; multichannel FM video transmission; optical dispersion; optical signal sources; single-mode fiber; television signal; Diode lasers; Dispersion; Distributed feedback devices; Intermodulation distortion; Optical distortion; Optical feedback; Optical fiber subscriber loops; Optical fibers; Optical modulation; TV;
Journal_Title :
Photonics Technology Letters, IEEE
