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Lourdudoss, SebastianORCID iD iconorcid.org/0000-0002-0977-2598
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Publications (10 of 200) Show all publications
Joharifar, M., Han, M., Schatz, R., Puerta, R., Sun, Y.-T., Fan, Y., . . . Pang, X. (2023). 8.1 Gbps PAM8 Long -Wave IR FSO Transmission using a 9.15-mu m Directly-Modulated QCL with an MCT Detector. In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC: . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA. IEEE
Open this publication in new window or tab >>8.1 Gbps PAM8 Long -Wave IR FSO Transmission using a 9.15-mu m Directly-Modulated QCL with an MCT Detector
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2023 (English)In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC, IEEE , 2023Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a Long-Wave IR FSO link with a 9.15-hm directly modulated quantum cascade laser at room temperature. Up to 8.1 Gb/s PAM8 transmission over 1.4 meter is achieved with a wideband MCT detector.

Place, publisher, year, edition, pages
IEEE, 2023
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-333809 (URN)001009232500393 ()
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA
Note

QC 20230810

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-08-10Bibliographically approved
Joharifar, M., Han, M., Schatz, R., Puerta, R., Sun, Y.-T., Fan, Y., . . . Pang, X. (2023). 8.1 Gbps PAM8 Long-Wave IR FSO Transmission using a 9.15-μm Directly-Modulated QCL with an MCT Detector. In: 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings: . Paper presented at 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023, San Diego, United States of America, May 5 2023 - May 9 2023. Institute of Electrical and Electronics Engineers (IEEE), Article ID Th1H.1.
Open this publication in new window or tab >>8.1 Gbps PAM8 Long-Wave IR FSO Transmission using a 9.15-μm Directly-Modulated QCL with an MCT Detector
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2023 (English)In: 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE) , 2023, article id Th1H.1Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a Long-Wave IR FSO link with a 9.15-μm directly modulated quantum cascade laser at room temperature. Up to 8.1 Gb/s PAM8 transmission over 1.4 meter is achieved with a wideband MCT detector.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-338620 (URN)10.23919/OFC49934.2023.10116892 (DOI)2-s2.0-85161288866 (Scopus ID)
Conference
2023 Optical Fiber Communications Conference and Exhibition, OFC 2023, San Diego, United States of America, May 5 2023 - May 9 2023
Note

Part of ISBN 9781957171180

QC 20231103

Available from: 2023-11-03 Created: 2023-11-03 Last updated: 2023-11-03Bibliographically approved
Strömberg, A., Manavaimaran, B., Srinivasan, L., Lourdudoss, S. & Sun, Y.-T. (2023). Epitaxial Lateral Overgrowth of GaAsP for III-V/Si-Based Photovoltaics. Physica Status Solidi (a) applications and materials science, 220(8), Article ID 2200623.
Open this publication in new window or tab >>Epitaxial Lateral Overgrowth of GaAsP for III-V/Si-Based Photovoltaics
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2023 (English)In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 220, no 8, article id 2200623Article in journal (Refereed) Published
Abstract [en]

GaAsP/Si with high crystalline quality fabricated by cost-effective heteroepitaxial technology is a promising pathway for realizing low-cost Si-based tandem solar cell with efficiency higher than 30%. Herein, hydride vapor-phase epitaxy is used to perform selective area growth of GaAsP with high lateral coverage, referred to as epitaxial lateral overgrowth (ELOG). The ELOG is performed on GaAs-based substrates as a prestudy, followed by GaAs/Si and GaAsP/Si seed wafers employing chemical mechanical polishing to fabricate full 2 00 GaAsP/Si templates. These are subsequently used to grow and process GaAsP/Si pn-junction structures for electrical characterization. The ELOG GaAsP is studied by spatially resolved photoluminescence (PL) mapping and high-resolution X-ray diffraction measurements. PL analysis of the GaAsP/GaAs ELOG samples reveals an enhanced P-incorporation during lateral growth of GaAsP. This is also observed for the GaAsP/Si ELOG templates along with evidence of improved material quality, clearly distinguishing the laterally grown GaAsP from the planar growth directly above the Si substrate. Leakage pathways causing reduced electrical performance of the ELOG GaAsP/Si pn-junction structures are identified.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
epitaxial lateral overgrowth, GaAsP/Si, hydride vapor-phase epitaxy
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-328312 (URN)10.1002/pssa.202200623 (DOI)000975595000007 ()2-s2.0-85148206536 (Scopus ID)
Note

QC 20230607

Available from: 2023-06-07 Created: 2023-06-07 Last updated: 2023-06-07Bibliographically approved
Han, M., Joharifar, M., Wang, M., Schatz, R., Puerta, R., Sun, Y.-T., . . . Pang, X. (2023). High Spectral Efficiency Long-Wave Infrared Free-Space Optical Transmission With Multilevel Signals. Journal of Lightwave Technology, 41(20), 6514-6520
Open this publication in new window or tab >>High Spectral Efficiency Long-Wave Infrared Free-Space Optical Transmission With Multilevel Signals
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2023 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 41, no 20, p. 6514-6520Article in journal (Refereed) Published
Abstract [en]

This study explores the potential of long-wave infrared free-space optical (FSO) transmission that leverages multilevel signals to attain high spectral efficiency. The FSO transmission system consists of a directly modulated-quantum cascade laser (DM-QCL) operating at 9.15 mu m and a mercury cadmium telluride (MCT) detector. To fully understand the system, we conduct measurements on the DM-QCL chip and MCT detector and assess the overall amplitude response of the DM-QCL, MCT detector, and all electrical components. We apply various signals, including on-off keying (OOK), 4-level pulse amplitude modulation (PAM4), 6-level PAM (PAM6), and 8-level PAM (PAM8) to maximize the bit rate and spectral efficiency of the FSO transmission. Through a two-dimensional sweeping of the laser bias current and MCT detector photovoltage, we optimize the transmission performance. At the optimal operation point, the FSO system achieved impressive results which are up to 6 Gbaud OOK, 3.5 Gbaud PAM4, 3 Gbaud PAM6, and 2.7 Gbaud PAM8 signal transmissions, with a bit error rate performance below 6.25% overhead hard decision-forward error correction limit when the DM-QCL operates at 10 degrees C. We also evaluate the eye diagrams and stability of the system to showcase its remarkable transmission performance. Our findings suggest that the DM-QCL and MCT detector-based FSO transceivers offer a highly competitive solution for the next generation of optical wireless communication systems.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
Free-space optical communication, intensity modulation, long-wave infrared, quantum cascade laser
National Category
Atom and Molecular Physics and Optics Communication Systems
Identifiers
urn:nbn:se:kth:diva-339607 (URN)10.1109/JLT.2023.3287934 (DOI)001079185200010 ()2-s2.0-85162889788 (Scopus ID)
Note

QC 20231115

Available from: 2023-11-15 Created: 2023-11-15 Last updated: 2023-11-15Bibliographically approved
Joharifar, M., Dely, H., Pang, X., Schatz, R., Gacemi, D., Salgals, T., . . . Sirtori, C. (2023). High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission With a Directly-Modulated QCL and a Fully-Passive QCD. Journal of Lightwave Technology, 41(4), 1087-1094
Open this publication in new window or tab >>High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission With a Directly-Modulated QCL and a Fully-Passive QCD
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2023 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 41, no 4, p. 1087-1094Article in journal (Refereed) Published
Abstract [en]

Free-space optics (FSO) in the mid-infrared (mid-IR) contains rich spectral resources for future ultrahigh-speed wireless communications yet is currently under-exploited. Two atmospheric transmission windows at the mid-IR, namely, the mid-wave IR (MWIR, 3-5 μm) and the long-wave IR (LWIR, 8-12 μm), show great potential in supporting free-space communications for both terrestrial and space application scenarios. Particularly, the LWIR signal with a longer wavelength has high intrinsic robustness against aerosols' scattering and turbulence-induced scintillation and beam broadening effects, which are the main concerns hindering the wide deployment of practical FSO systems. In this context, high-bandwidth semiconductor-based mid-IR FSO transceivers will be desirable to meet the requirements of low energy consumption and small footprints for large-volume development and deployment. Quantum cascade devices, including quantum cascade lasers (QCLs) and quantum cascade detectors (QCDs), appear promising candidates to fulfill this role. In this work, we report a high-speed LWIR FSO transmission demonstration with a 9.6-μm directly-modulated (DM)-QCL and a fully passive QCD without any active cooling or bias voltage. Up to 8 Gb/s, 10 Gb/s, and 11 Gb/s signal transmissions are achieved when operating the DM-QCL at 10 °C, 5 °C, and 0 °C, respectively. These results indicate a significant step towards an envisioned fully-connected mid-IR FSO solution empowered by the quantum cascade semiconductor devices. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
Free-space optics, long-wave infrared, quantum cascade detector, quantum cascade laser, Coplanar waveguides, Energy utilization, Infrared devices, Infrared radiation, Molecular beam epitaxy, Quantum cascade lasers, Radio transceivers, Space optics, Directly modulated, Free-space transmission, Freespace optics, High Speed, Longwave infrared, Midinfrared, Quantum cascade detectors, Semiconductor device measurements, Ultra high speed, Wireless communications, Temperature measurement
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-328104 (URN)10.1109/JLT.2022.3207010 (DOI)000992271600006 ()2-s2.0-85139421601 (Scopus ID)
Note

QC 20230602

Available from: 2023-06-02 Created: 2023-06-02 Last updated: 2023-07-06Bibliographically approved
Manavaimaran, B., Strömberg, A., Tassev, V. L., Vangala, S. R., Bailly, M., Grisard, A., . . . Sun, Y.-T. (2023). Investigation of OP-GaP Grown on OP-GaAs Templates Using Nondestructive Reciprocal Space Mapping. Crystals, 13(2), 168, Article ID 168.
Open this publication in new window or tab >>Investigation of OP-GaP Grown on OP-GaAs Templates Using Nondestructive Reciprocal Space Mapping
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2023 (English)In: Crystals, ISSN 2073-4352, Vol. 13, no 2, p. 168-, article id 168Article in journal (Refereed) Published
Abstract [en]

Orientation-patterned gallium phosphide (OP-GaP) has been grown heteroepitaxially on OP gallium arsenide (GaAs) templates using hydride vapor phase epitaxy (HVPE). The effect of OP-GaAs template fabrication methods of epitaxial-inversion and wafer bonding on the heteroepitaxial OP-GaP growth has been investigated. OP-GaP layers with a growth rate of up to 35 mu m/h and excellent domain fidelity were obtained. The growth rate and the domain fidelity have been revealed/studied by scanning electron microscope (SEM). In addition, we demonstrate that the crystalline quality of the individual domains, namely, the substrate-oriented domains (ODs) and the inverted domains (IDs), can be investigated by high-resolution x-ray diffraction reciprocal space mapping (HRXRDRSM), which can also indicate the domain fidelity. Attempts to increase the growth rate and improve the domain fidelity by increasing the III and V group precursors resulted in either an increase in the growth rate in the OP-GaP layers grown on epitaxial inversion OP-GaAs template at the expense of the domain crystalline quality and fidelity or an improvement in the crystalline quality of the domains at the expense of the growth rate in the OP-GaP layers grown on wafer-bonded OP-GaAs templates. In the case of OP-GaP grown on OP-GaAs templates prepared by epitaxial inversion, the crystalline quality of the ODs is better than that of the IDs, but it shows that the quality of the inverted layer in the template influences the quality and fidelity of the grown domains. To the authors' knowledge, exploitation of HRXRDRSM studies on OP-GaP to establish the crystalline quality of its individual domains (ODs and IDs) is the first of its kind. OP-ZnSe grown on OP-GaAs templates has also been included in this study to further emphasize the potential of this method. We propose from this study that once the growth rate is optimized from SEM studies, HRXRDRSM analysis alone can be used to assess the structural quality and to infer the domain fidelity of the OP structures.

Place, publisher, year, edition, pages
MDPI AG, 2023
Keywords
hydride vapor phase epitaxy, GaP, orientation patterned templates, GaAs, heteroepitaxy, HRXRD, reciprocal space map, domain fidelity
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-324799 (URN)10.3390/cryst13020168 (DOI)000938981100001 ()2-s2.0-85149236036 (Scopus ID)
Note

QC 20230316

Available from: 2023-03-16 Created: 2023-03-16 Last updated: 2023-03-16Bibliographically approved
Puerta, R., Han, M., Joharifar, M., Schatz, R., Sun, Y.-T., Fan, Y., . . . Pang, X. (2023). NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks. In: 2023 Optical Fiber Communications Conference and Exhibition (OFC): . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>NR Conformance Testing of Analog Radio-over-LWIR FSO Fronthaul link for 6G Distributed MIMO Networks
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2023 (English)In: 2023 Optical Fiber Communications Conference and Exhibition (OFC), Institute of Electrical and Electronics Engineers (IEEE) , 2023Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally test the compliance with 5G/NR 3GPP technical specifications of an analog radio-over-FSO link at 9 mu m. The ACLR and EVM transmitter requirements are fulfilled validating the suitability of LWIR FSO for 6G fronthaul.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-333802 (URN)10.23919/OFC49934.2023.10117234 (DOI)001009232500544 ()2-s2.0-85161033979 (Scopus ID)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA
Note

QC 20230810

Part of ISBN 979-8-3503-1229-4

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2024-03-12Bibliographically approved
Strömberg, A., Manavaimaran, B., Pang, X., Schatz, R., Ozolins, O., Lourdudoss, S., . . . Sun, Y.-T. (2023). Semi-insulating InP:Fe growth by hydride vapor phase epitaxy for advanced buried heterostructure quantum cascade lasers. In: Novel In-Plane Semiconductor Lasers XXII: . Paper presented at Novel In-Plane Semiconductor Lasers XXII 2023, San Francisco, United States of America, Jan 31 2023 - Feb 2 2023. SPIE-Intl Soc Optical Eng, Article ID 1244009.
Open this publication in new window or tab >>Semi-insulating InP:Fe growth by hydride vapor phase epitaxy for advanced buried heterostructure quantum cascade lasers
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2023 (English)In: Novel In-Plane Semiconductor Lasers XXII, SPIE-Intl Soc Optical Eng , 2023, article id 1244009Conference paper, Published paper (Refereed)
Abstract [en]

Buried heterostructure quantum cascade lasers (BH-QCLs) operating at high temperature in mid-infrared (MIR) to THz spectral range are desired for chemical sensing and free-space optical communication (FOC). In this work, Fe doped semi-insulating InP (SI-InP) regrowth is demonstrated in a hydride vapor phase epitaxy (HVPE) reactor for advanced MIR and THz BH-QCLs grown by MBE and MOCVD. SI-InP regrowth is implemented in THz QCL pillar arrays and narrow width and reverse-taper MIR BH-QCLs for efficient heat dissipation. By exploiting SI-InP regrowth, the parasitic capacitance in MIR distributed feedback BH-QCL can be suppressed, which is exploited for high speed FOC application.

Place, publisher, year, edition, pages
SPIE-Intl Soc Optical Eng, 2023
Keywords
buried heterostructure quantum cascade laser, Hydride vapor phase epitaxy, mid-infrared free space optical communication, semi-insulating InP, terahertz quantum cascade laser
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-338637 (URN)10.1117/12.2645959 (DOI)2-s2.0-85160701219 (Scopus ID)
Conference
Novel In-Plane Semiconductor Lasers XXII 2023, San Francisco, United States of America, Jan 31 2023 - Feb 2 2023
Note

Part of ISBN 9781510659858

QC 20231030

Available from: 2023-10-30 Created: 2023-10-30 Last updated: 2023-10-30Bibliographically approved
Pang, X., Dely, H., Schatz, R., Gacemi, D., Joharifar, M., Salgals, T., . . . Sirtori, C. (2022). 11 Gb/s LWIR FSO Transmission at 9.6 mu m using a Directly-Modulated Quantum Cascade Laser and an Uncooled Quantum Cascade Detector. In: 2022 Optical Fiber Communications Conference and Exhibition, OFC 2022 - Proceedings: . Paper presented at 2022 Optical Fiber Communications Conference and Exhibition, OFC, 2022, San Diego, 6 March 2022 through 10 March 2022. Institute of Electrical and Electronics Engineers (IEEE), Article ID Th4B.5.
Open this publication in new window or tab >>11 Gb/s LWIR FSO Transmission at 9.6 mu m using a Directly-Modulated Quantum Cascade Laser and an Uncooled Quantum Cascade Detector
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2022 (English)In: 2022 Optical Fiber Communications Conference and Exhibition, OFC 2022 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2022, article id Th4B.5Conference paper, Published paper (Refereed)
Abstract [en]

Record 11 Gb/s LWIR FSO transmission is demonstrated with a 9.6-mu m directly-modulated QCL and a fully passive QCD without cooling, surpassing the previous bitrate record of DM-QCL-based FSO in this spectral window by 4 times.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2022
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-316302 (URN)000828152500430 ()2-s2.0-85128888017 (Scopus ID)
Conference
2022 Optical Fiber Communications Conference and Exhibition, OFC, 2022, San Diego, 6 March 2022 through 10 March 2022
Note

QC 20220812

Part of proceedings: ISBN 978-155752466-9

Available from: 2022-08-12 Created: 2022-08-12 Last updated: 2022-08-12Bibliographically approved
Pang, X., Dely, H., Schatz, R., Gacemi, D., Joharifar, M., Salgals, T., . . . Sirtori, C. (2022). 11 Gb/s LWIR FSO Transmission at 9.6 µm using a Directly-Modulated Quantum Cascade Laser and an Uncooled Quantum Cascade Detector. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Communication Conference, OFC 2022, San Diego, CA, USA, 6-10 March 2022. Optica Publishing Group (formerly OSA), Article ID Th4B.5.
Open this publication in new window or tab >>11 Gb/s LWIR FSO Transmission at 9.6 µm using a Directly-Modulated Quantum Cascade Laser and an Uncooled Quantum Cascade Detector
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2022 (English)In: Optics InfoBase Conference Papers, Optica Publishing Group (formerly OSA) , 2022, article id Th4B.5Conference paper, Published paper (Refereed)
Abstract [en]

Record 11 Gb/s LWIR FSO transmission is demonstrated with a 9.6-µm directly-modulated QCL and a fully passive QCD without cooling, surpassing the previous bitrate record of DM-QCL-based FSO in this spectral window by 4 times.

Place, publisher, year, edition, pages
Optica Publishing Group (formerly OSA), 2022
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-329716 (URN)2-s2.0-85136942257 (Scopus ID)
Conference
Optical Fiber Communication Conference, OFC 2022, San Diego, CA, USA, 6-10 March 2022
Note

Part of ISBN 9781557528209

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-06-26Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-0977-2598

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