Hassan Mousa

• to

D = λA ± λB± λC here, A≠B≠C
FWM Reduction technique
In this stage the hybrid modulator portion is the
combination of optical PM modulator followed by an
optical AM modulator. The optical PM modulator
introduces the phase mismatch in each wavelength
which then adds constructively or destructively by the
AM modulator
Fig.1 Block Diagram for FWM Reduction technique
Fig 2. Block Diagram for Continuous Wave four Wave
Mixing conversions
The continuous wave FWM reduction method uses the
hybrid combination of one electrical and three optical
modulators. The electrical modulator is CPFSK whose
output is connected with optical Dual Port Dual Drive
Mach Zehnder modulator followed by Dual Drive Mach
Zehnder and AM Optical modulator respectively. The
electrical CPFSK modulator is responsible for
generating the distortion in the signal. This technique
can be employed for short distances and low power
consuming system.
3. DWDM topologies and simulation setup
There are 4 nodes fiber link are 8 and number of node
level are 1.8-channel 2.5 Gbps WDM system, sample
rate of 160 GHz, sequence length of 128 bits, 64
samples per bit, bit rate of 2.5 Gbps, operating at
normal mode, NRZ pulse generator with hybrid
modulation schemes. Fiber:-non- zero dispersion fiber,
length of 50-100 Km, dispersion value of 16.75
ps/nm/km and a reference wavelength of 1550 nm,
Optical amplifier:- EDFA with operating wavelength of
1550 nm. The filter used on the receiving side is a Low
Pass Bessel Filter with a cut-off frequency of 0.75*Bit
rate.
Hassan Mousa Mohamed et al Enhanced continuous-wave four-wave mixing using Hybrid Modulation Technique
1379| International Journal of Current Engineering and Technology, Vol.6, No.4 (Aug 2016)
Table 1 Nodes simulation setup
Node ID
Node
Position(X, Y)
Node
Population
Node
Timezone
Node
Level
Nr Available
TXs
Nr Available
RXs
Nr Available
TWCs
1 (0.50, 1.50) 8393 1