SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication
This paper proposes a semiconductor optical amplifier (SOA)-based multilevel polarization shift on–off keying (MPS-OOK) transmission for free-space optical (FSO) communication. At the transmitter end, the MPS-OOK signal is modulated with a constant linear state of polarization (SOP) at the high-inte...
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| Format: | Article |
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MDPI AG
2021-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/8/4/100 |
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| author | Yan-Qing Hong Do-Hoon Kwon Jae-Young Choi In-Ho Ha Won-Ho Shin Sang-Kook Han |
| author_facet | Yan-Qing Hong Do-Hoon Kwon Jae-Young Choi In-Ho Ha Won-Ho Shin Sang-Kook Han |
| author_sort | Yan-Qing Hong |
| collection | DOAJ |
| description | This paper proposes a semiconductor optical amplifier (SOA)-based multilevel polarization shift on–off keying (MPS-OOK) transmission for free-space optical (FSO) communication. At the transmitter end, the MPS-OOK signal is modulated with a constant linear state of polarization (SOP) at the high-intensity level and various SOPs at the low-intensity level in order to improve the spectral efficiency (SE) with the transmitted power efficiency. At the receiver end, first, a polarization-independent SOA was introduced to optically suppress the turbulence-induced scintillation effect and equalize the intensities of the various SOPs in the deep gain saturation state without polarization distortion. Then, a linear polarizer (LP) with a high extinction ratio (ER) was deployed to convert the equalized SOPs into a known intensity. Finally, the converted MPS-OOK signal was detected using a single photodiode (PD) and distinguished using a multilevel fixed-threshold decision (M-FTD). The proposed technique was evaluated using experiments. A Mach–Zehnder modulator (MZM)-based fading simulator was introduced to emulate the turbulence-induced scintillation effect. The experimental results demonstrated that the scintillation effect was effectively mitigated and the SE was improved by up to 2 bit/s/Hz using the proposed four-level polarization shift on–off keying (4PS-OOK) transmission. |
| first_indexed | 2024-03-10T12:45:03Z |
| format | Article |
| id | doaj.art-f4a12194b1ea440a9dff886b7422f5e8 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T12:45:03Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-f4a12194b1ea440a9dff886b7422f5e82023-11-21T13:38:02ZengMDPI AGPhotonics2304-67322021-03-018410010.3390/photonics8040100SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical CommunicationYan-Qing Hong0Do-Hoon Kwon1Jae-Young Choi2In-Ho Ha3Won-Ho Shin4Sang-Kook Han5Department of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaDepartment of Electrical and Electronics Engineering, Yonsei University, Seoul 03722, KoreaThis paper proposes a semiconductor optical amplifier (SOA)-based multilevel polarization shift on–off keying (MPS-OOK) transmission for free-space optical (FSO) communication. At the transmitter end, the MPS-OOK signal is modulated with a constant linear state of polarization (SOP) at the high-intensity level and various SOPs at the low-intensity level in order to improve the spectral efficiency (SE) with the transmitted power efficiency. At the receiver end, first, a polarization-independent SOA was introduced to optically suppress the turbulence-induced scintillation effect and equalize the intensities of the various SOPs in the deep gain saturation state without polarization distortion. Then, a linear polarizer (LP) with a high extinction ratio (ER) was deployed to convert the equalized SOPs into a known intensity. Finally, the converted MPS-OOK signal was detected using a single photodiode (PD) and distinguished using a multilevel fixed-threshold decision (M-FTD). The proposed technique was evaluated using experiments. A Mach–Zehnder modulator (MZM)-based fading simulator was introduced to emulate the turbulence-induced scintillation effect. The experimental results demonstrated that the scintillation effect was effectively mitigated and the SE was improved by up to 2 bit/s/Hz using the proposed four-level polarization shift on–off keying (4PS-OOK) transmission.https://www.mdpi.com/2304-6732/8/4/100multilevel polarization shift on–off keyingsemiconductor optical amplifierscintillation effectspectral efficiencyfree-space optical communications |
| spellingShingle | Yan-Qing Hong Do-Hoon Kwon Jae-Young Choi In-Ho Ha Won-Ho Shin Sang-Kook Han SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication Photonics multilevel polarization shift on–off keying semiconductor optical amplifier scintillation effect spectral efficiency free-space optical communications |
| title | SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication |
| title_full | SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication |
| title_fullStr | SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication |
| title_full_unstemmed | SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication |
| title_short | SOA-Based Multilevel Polarization Shift On–Off Keying Transmission for Free-Space Optical Communication |
| title_sort | soa based multilevel polarization shift on off keying transmission for free space optical communication |
| topic | multilevel polarization shift on–off keying semiconductor optical amplifier scintillation effect spectral efficiency free-space optical communications |
| url | https://www.mdpi.com/2304-6732/8/4/100 |
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