Abstract
In this paper, a theoretical investigation of the performance of a communication scenario where a geostationary-orbit satellite provides radio-frequency broadband access to the users through orthogonal-frequency-division multiplexing technology and has an optical feeder link is presented. The interface between the radio frequency and the optical parts is achieved by using radio-on-fiber technology for optical-electro and electro-optical conversion onboard and no further signal processing is required. The proposed scheme has significant potential, but presents limitations related to the noise. The noise in both forward and reverse links is described, and the system performance for an example scenario with 1280 MHz bandwidth for QPSK, 16QAM, and 64QAM subcarrier modulation is estimated. The obtained results show that under certain conditions regarding link budget and components choice, the proposed solution is feasible.
Highlights
Satellite laser communication technology is gaining popularity by offering reduced system size, weight, and power (SWaP) as well as a wider bandwidth [1,2,3,4]
A row called “Additional gain” was added to bring 0 dB gain in the uplink, but if an AO system is installed in the optical ground station (OGS), that could add a gain of 7 dB [11], or even over 10 dB in the downlink [12]
The desired signal power in the PD can be expressed as Considering the losses in the OGS and the required levels for the optical uplink budget, an optical amplifier (OA) with very high gain is necessary in the optical ground station
Summary
Satellite laser communication technology is gaining popularity by offering reduced system size, weight, and power (SWaP) as well as a wider bandwidth [1,2,3,4]. In order to release more RF bandwidth to be used for different applications and/or higher data rates, an optical feeder link that is to be used as a backhaul link between the satellite and the fixed base station on the ground is considered For such high throughput satellites (HTS), employing both RF and optical technologies of critical importance is the RFoptical interface solution. To facilitate the coupling for all the methods, there are several technologies including tip/tilt correction that can compensate relatively fast the beam wandering [10], and adaptive optics (AO [11, 12]) correction, that is widely used in astronomy to correct the beam wavefront aberrations after propagating through the turbulent atmosphere For this purpose, a row called “Additional gain” was added to bring 0 dB gain in the uplink, but if an AO system is installed in the optical ground station (OGS), that could add a gain of 7 dB [11], or even over 10 dB in the downlink [12]. In the following noise analysis the same notations with small letters denote values, used as coefficients for easier noise calculation
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