Integrated Wireless-pon access Network Architectures Milos Milosavljevic


Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells



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Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells 
122 
transmission, the modulated wavelengths are multiplexed at the commercially available AWG 
[17] and broadcasted to each ONU/BSs of the corresponding PON through 20km of SSMF.
Figure 6-3 shows the resulting optical spectrum at the AWG output clearly demonstrating two 
FDM windows modulated on each optical carrier using ODSB modulation. Single sideband 
(SSB) modulation could also be considered for longer fibres to reduce chromatic dispersion on 
the received channels. However, it typically requires additional optical band pass filters at the 
output of the optical modulator to select one band, increasing the cost of the system.
Figure 6-3: Transmitted optical spectrum observed at the output of the AWG
The 5×5 Gaussian dense AWG [17] with 100 GHz channel spacing, displayed in Figure 6-4, 
comprises two identical standard Gaussian AWG modules employed to accommodate the two 
waveguide transmitted modes, the transverse electric (TE) and transverse magnetic (TM). The 
odd number of AWG input/output ports was considered for simplicity since the same 
performance is expected for any port sizes. As displayed in the figure, each of the five input 
ports of the model is applied at a polarisation beam splitter (PBS), where its x and y coordinated 
outputs are applied at the corresponding TE and TM mode AWGs. Subsequently, the outputs of 


Chapter 6 Multi-Wavelength WiMAX-PONs with Overlapping Cells 
123 
the two AWGs are combined using polarisation beam combiners (PBCs) and applied at each of 
the corresponding output ports of the model providing realistic performance. 
Figure 6-4: AWG modeling in VPI
The 
VPI Table
6-3 includes the design parameters for the TM mode only. The central 
wavelength is set to 1553.33 nm with 3.5 dB insertion loss [17]. Similar parameters are 
considered for the TE mode at an additional 0.2 dB polarisation depended loss added to the 
inherited insertion loss [17]. The adjacent channel crosstalk was set to 26 dB matching closely 
the performance figure of the data sheet model [17]. 

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