Abstract
A novel scheme which can realize high-speed optical signals transmission and reception by using 4-pulsed amplitude modulation (4-PAM) and demodulation in 10 Gb/s passive optical access systems with different bandwidth optical Bessel filter (OBF) is introduced. In this scheme, a PAM sequence generator module, an M-ary pulse generator module and one Mach-Zehnder intensity Modulator (MZM) are employed for generating the 10 Gb/s optical 4-PAM signals. And then, the generated optical 4-PAM signal achieves transmission over 20 km single mode fiber (SMF) for downstream (DS) access links application. Finally, the optical 4-PAM signal after transmission is directly detected and demodulated. We measure time-domain sequential waveform curves, optical spectrum curves, and eye-diagrams, and analyze the receiver sensitivity of 10 Gb/s 4-PAM signals before and after transmission. The received performance of the optical 4-PAM signals after transmission over 20 km single mode fiber (SMF) with different bandwidth OBF has also been analyzed.
Highlights
With the explosive growth of internet-based services such as Internet video, cloud computing, the existing standardized passive optical network (PON) system might not be sufficient in the coming years [1]
The received performance of the optical 4-pulsed amplitude modulation (4-pulse-amplitude modulation (PAM)) signal transmitted over 20 km single mode fiber (SMF) with different bandwidth optical Bessel filter (OBF) has been analyzed
Two optical spectra diagrams of 4-PAM signal before transmission and after transmission are shown in Figure 3(a) and Figure 3(b) respectively
Summary
With the explosive growth of internet-based services such as Internet video, cloud computing, the existing standardized passive optical network (PON) system might not be sufficient in the coming years [1]. In order to deploy a higher data rate access network with lower cost, high spectrum efficiency modulation formats should be introduced [2]. Compared with the binary format such as NRZ, the 4-PAM signal has higher spectrum efficiency and that will achieve high data rate information transmission with lower bandwidth for free passive optical access applications. Optical 4-PAM signals are generated, transmitted over 20 km SMF as downlink signals, and received using OBF with different bandwidth values. We measured time-domain sequential waveform curves, optical spectrum curves, and eye-diagrams, and analyze the receiver sensitivity of 10 Gb/s 4-PAM signals before and after transmission by simulation. The received performance of the optical 4-PAM signal transmitted over 20 km single mode fiber (SMF) with different bandwidth OBF has been analyzed
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