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A novel scheme for optical millimetre-wave (mm-wave) generation based on tandem sub-carrier multiplexing in hybrid communication systems is suggested. The method is analysed mathematically for optimum settings. The tandem single side-band (TSSB) method is tolerant to fibre chromatic dispersion. However, the TSSB technique is prone to critical inter...
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Context 1
... mathematical analysis of the TSSB modulation. Two cascaded MZMs are applied in this paper to generate mm-wave signals. The first MZM is biased at the quadrature point to generate the optical tandem spectra of two different modulated RF signals. The cascaded MZM is biased at its null point in order to up-convert the RF frequencies to 60 GHz range. Fig. 1 represents the block diagram of the suggested method for optical mm-wave ...
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... GHz (in section B) away from the mm-wave generating frequencies (− f 1 -f 3 , f 3 , − f 3 , f 2 + f 3 ). If frequencies f 1 , f 2 and f 3 are not chosen properly, interference between unwanted harmonics and mm-wave generating signals will occur which will drastically degrade the system performance. This degradation is discussed more in Section 3. Fig. 1 is implemented as the simulation model of the link in order to generate optical mm-wave signals. First, a pseudo random binary sequence of order 9 is used to generate data with a rate of 1 Gb/s for each channel. RF signals (which are generated by two oscillators with frequencies of f 1 and f 2 ) are modulated by non-return to zero ...
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Citations
Two cascaded Mach-Zehnder modulators (MZMs) are utilized to generate optical single-side band millimeter wave signals. This modulation scheme is tolerant to fiber chromatic dispersion effect for long distance communication. Since, electrical voltage setting is critical to control the unwanted harmonics' power, harmonic distortions analysis is necessary for the two cascaded MZMs. Second order (HD2) and third order (HD3) harmonic distortions due to the intrinsic nonlinear electric/optic transfer curve of the two cascaded dual electrode MZMs are mathematically obtained and analyzed. These dual electrode MZMs are used to generate OSSB 60-GHz sub-bands. In order to compare second and third order harmonic distortions' effects on the mm-wave generation system, noise to signal ratio (NSR) curves are represented. HD2 and HD3 are studied in this article and the results represent the second order distortion should be regarded as a minatory factor for the system.
