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wdm optical interfaces for future fiber radio systems phần 10

Tham khảo tài liệu 'wdm optical interfaces for future fiber radio systems phần 10', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 6 Integration of Millimetre-Wave Fibre-Radio Networks in WDM Optical Access Infrastructure The modulated signals were then applied to the AWG as shown in Fig. 6. 7. The allocation of the input ports and the selection of the loop-back paths are maintained in such a way that the resultant output of the AWG is the desired interleaved signals. Fig. 6.9 shows the combined spectrum of the signals after multiplexing which confirms the functionality of the proposed H-MUX enabling wavelength interleaving for the modulated multiband signals in an integrated DWDM access network. The spectrum also indicates that the multiplexing of the signals using such -10 -30 -50 -70 1555.9 1556.3 1556.7 Fig. 6.10 Measured optical spectra for the recovered a RF b BB and c IF signals at the OADM interface. 255 Chapter 6 Integration of Millimetre-Wave Fibre-Radio Networks in WDM Optical Access Infrastructure H-MUX reduces the CSR of optical RF signal to 5 dB attaining an effective reduction by 8 dB. The composite signal was then amplified by an erbium-doped-fibre-amplifier EDFA and followed by a 4-nm optical band pass filter BPF prior to transmission over 10 km of singlemode fibre SMF to a BS where each of the multiplexed signals was recovered using a suitable optical add-drop-multiplexing OADM interface. The OADM interface which is comprised of a double-notch tunable fibre Bragg grating FBG and a 3-port optical circulator recovers each of the signals separately a Wavelength nm b Wavelength nm c Fig. 6.11 Measured optical spectra for the signals passing through while recovering a RF b BB and c IF signals using the OADM interface. 256 Chapter 6 Integration of Millimetre-Wave Fibre-Radio Networks in WDM Optical Access Infrastructure from the interleaved signals by shifting the centre frequencies of the FBG. The spectra of recovered signals can be seen from Fig. 6.10 a - c . The spectra for the signals passing through the OADM interface are also shown in Fig. 6.11 a - c . The optical .