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Linearized Single Sideband Modulation Link with High SFDR Performance
摘要： A linearized fiber optic link without dispersion induced power fading is presented. It is based on using a dual-drive dual-polarization modulator to generate a single sideband RF modulated optical signal and an orthogonally linear polarized unmodulated optical signal. The link is linearized and consequently the third order spurious free dynamic range (SFDR3) is largely increased by designing the angle of a linear polarizer connected to the modulator output to suppress the third order intermodulation distortion. The two Mach Zehnder modulators inside the dual-polarization modulator are biased at the quadrature point. Hence there is no degradation in the link second order spurious free dynamic range (SFDR2) performance compared to the conventional quadrature-biased Mach Zehnder modulator link. Experimental results demonstrate a single sideband modulation link without dispersion induced power fading and a record measured SFDR3 of 121.4 dB?Hz4/5.
关键词： optical single sideband,intermodulation distortion,linearization techniques,dynamic range,Analog optical links
更新于2025-09-23 15:22:29
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Performance analysis of direct detection optical OFDM systems
摘要： Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique, in which the data information is carried over many lower rate subcarriers. This technique is started effectively using in both line communication and wireless communication systems. This modulation technique has been actively started in the field of light wave communication called optical OFDM (OOFDM) system. OOFDM is a multicarrier modulation technique; it is used to overcome the problem of inter-symbol interference due to the chromatic dispersion and polarization mode dispersion of the fiber channel. In this paper, we have done simulation on direct detection optical OFDM (DDOOFDM) system with data rate of 10Gbps and measuring performance analysis of DDOOFDM system with respect to the received optical power and various full width half maximum value of the continuous wave laser source. This analysis is simulated using RSOFT Design Group OptSim Version-5.2.
关键词： Mach-Zehnder Modulator (MZM),Coherent Detection Optical OFDM (COOFDM),Optical Band Pass Filter (OBPF),Optical Single Sideband (OSSB),Full Width Half Maximum (FWHM),Direct Detection Optical OFDM (DDOOFDM)
更新于2025-09-04 15:30:14