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Abstract
Coping up with the rising bandwidth demands for 5G ultra-high speed applications, utilizing millimeter (MM) wave spectrum for data transmission over the radio over a fiber-based system is the ideal approach. In this study, a highly conversant and spectrally pure photonic generation of a 16-tupled MM wave signal using a series-connected DD-MZM with a lower modulation index, a splitting ratio, and a wider tunable range is presented. A 160-GHz MM wave is generated through a double sideband optical carrier suppression technique having an optical sideband suppression ratio (OSSR) of 69 dB and a radio frequency sideband suppression ratio (RSSR) of 40 dB. However, the OSSR and the RSSR are tunable with values greater than 15 dB when the modulation index (M.I.) varies from 2.778 to 2.873, ±8° phase drift, and a 15-dB enhancement in the OSSR with a wider nonideal parameter variation range giving acceptable performance can be seen in the model as compared with previous research works.
Highlights
For supporting multi gigabit per second wireless connectivity and resolving spectrum shortage, 5G uses higher frequencies from an MM wave range (30–300 GHz) for signal transmission
This output from Mach–Zehnder Modulator (MZM)-B is an input to the third MZM triggered by the RF signal with an electrical phase difference of 135°
ΒEMZM−B(t){J0(ma) − J2(ma)} ej2ωRFt + e−j2ωRFt + J4(ma) ej4ωRFt + e−j4ωRFt − J6(ma) ej6ωRFt + e−j6ωRFt + J8(ma) ej8ωRFt + e−j8ωRFt − J10(ma) ej10ωRFt + e−j10ωRFt + J12(ma) ej12ωRFt + e−j12ωRFt. This output is fed to the last modulator, that is, MZM-D which is driven by the RF signal phase shifted by 225°
Summary
For supporting multi gigabit per second (gbps) wireless connectivity and resolving spectrum shortage, 5G uses higher frequencies from an MM wave range (30–300 GHz) for signal transmission. In order to cope up with this issue, the MM wave signal is first generated by modulating a low-frequency electrical signal over an optical carrier coming from a light source at a central station (CS) and transmitting it to the base station (BS). This technique is named as millimeter wave–based radio over the fiber (i.e., MMoF) system. MM wave signal generation in a photonic domain is best suited in comparison to their electrical counterparts due to lower phase noise, lower equipment requirement, higher spectral purity, a wider tunable range, and a larger transmission distance [1]. Several different techniques have been discussed in the past for photonic MM wave signal generation which include a direct
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