In this paper, the absolute added correlative coding (AACC), a multilevel intensity modulation and direct-detection (IM/DD) format, is investigated using the return-to-zero (RZ) line code. It is further subjected to the polarization division multiplexing (PDM) technique and applied to an optical wireless communication (OWC) system modelled to simulate an optical inter-satellite link (OISL) operating in a low Earth orbit (LEO) satellite broadband constellation network. Its receiver front-end (RFE) comprises avalanche photodiode (APDs) paired with transimpedance amplifiers (TIAs) and its performance is evaluated for several OISL parameters. These include power efficiency, supported transmission ranges, receiver sensitivity and spectral efficiency. For each parameter, its performance is further compared to three other links adopting the RZ-AACC, AACC and 4-pulse amplitude modulation (4-PAM) formats. To support a bit rate of 20 Gbps across the maximum LEO-LEO OISL distance of 6000 km, whilst keeping to the bit-error rate (BER) requirement of $10^{-9}$, the modelled RZ-PDM-AACC link required a minimum transmitter laser power of 26 dBm. The latter three needed 30 dBm, 29 dBm and 35 dBm. Then, at 30 dBm, both the RZ-PDM-AACC and AACC supported the bit rate across the maximum link distance whereas the RZ-AACC and 4-PAM sustained it up to a link distance of 5200 km and 3000 km, respectively. The RZ-PDM-AACC further observed an increase of 2.3 dB, 4 dB and 11 dB in receiver sensitivity as well as an improvement in spectral efficiency against the RZ-AACC, AACC and 4-PAM modulated OISLs.
Investigating Multilevel Intensity Modulation Formats for LEO-LEO OISLs
11.10.2023
936439 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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