Enhanced absolute added correlative coding for low earth orbit optical intersatellite links
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Amrita Gill
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Gnanam Gnanagurunathan
Abstract
This paper presents the polarization division multiplexed absolute added correlative coding (PDM-AACC) in an optical intersatellite link (OISL). It is modeled to operate in a low Earth orbit (LEO) satellite broadband constellation network, and its receiver front-end (RFE) comprises avalanche photodiodes (APDs). Its performance is then comparatively investigated against two other OISLs adopting the absolute added correlative coding (AACC) and the 4-pulse amplitude modulation (4-PAM) formats, respectively. When transmitting 20 Gbps over the maximum LEO-LEO link distance of 6,000 km, the 4-PAM and AACC needed a minimum transmitter laser power of 36 dBm and 29 dBm to meet the bit-error rate (BER) requirement of less than 10−9, whereas the PDM-AACC required 27 dBm. It also supported longer transmission ranges, narrower telescope pointing error angles, and smaller telescope aperture diameter sizes in comparison to the 4-PAM and the AACC. The modeled PDM-AACC modulated OISL further improved on the receiver sensitivities of the latter two by 10 dBm and 2 dBm in addition to increasing its spectral efficiencies. The bit rate of all three links were then doubled to 40 Gbps. While the 4-PAM and AACC sustained it for distances of 2,800 km and 4,800 km, the PDM-AACC met the BER requirement for distances of up to 6,200 km.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: Not applicable.
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