Hi Ranjeet,
I agree with your points of using optical single
side band (SSB).The transmitted signal (A) is fed to a
high-Finesse Fabry-Perot etalon (FP) through an
optical circulator (OC).
Use cascaded amplifiers, the performance of the system can be enhanced. EDFA when combined with Raman to
form hybrid amplifier it have advantages over individual amplifiers, designed hybrid
Raman/EDFA for yielding closed form analysis by considering the fiber non-linearities. observed by
combining the Raman/EDFA, maximum repeater-less transmission distance increases compared to individual
amplifier.
Use Parameters of laser source are: line-width =
10MHz and power = 10dBm. Mach-Zehander modulator with extinction ratio = 15dB is used as the external
modulator to modulate data source signals using laser.
Transmitted signals are multiplexed and launched in to optical fiber, where YDFA is used to amplify the signals.
Results are evaluated by varying the length of optical fiber from 40-160km. Parameters of optical fiber are:
attenuation = 0.2dB/km, dispersion slope = 0.07ps/nm2
/km and dispersion = 6ps/nm/km. Parameters of YDFA are:
length = 5m, ytterbium ion density = 1×1025m-3
, ytterbium doping radius = 3.4µm and numerical aperture = 0.2.