Journals Articles

J16

O-Band Quantum-Dot Mode-Locked Laser Frequency Comb for Terabit Optical Transport

Lakshmi Narayanan Venkatasubramani*, Ahmed Galib Reza*, Sean O'Duill, Mikhail Buyalo, Janina Rautert, Alexey Gubenko and Liam P. Barry

*- Equally Contributed

Optics Express DOI: 10.1364/OE.569003 (2025)

IM/DD | Data Centre Interconnects | Device Characterisation | Digital Signal Processing | Mode Locked Lasers

J15

112.5 Gbit/s long reach passive optical network with over 31 dB power budget enabled by semiconductor optical amplifiers

Ahmed Galib Reza*, Lakshmi Narayanan Venkatasubramani*, and Liam P. Barry

*- Equally Contributed

Nature Portfolio Scientific Reports (Sci Rep) DOI: 10.1038/s41598-025-12857-z (2025)

IM/DD | Access Networks | Device Characterisation | Digital Signal Processing | Power Budget

J14

Bidirectional 100G/150G Amplified Transmission With a QD-SOA for Future Passive Optical Networks

Ahmed Galib Reza, Lakshmi Narayanan Venkatasubramani, Vladimir S. Mikhrin, Alexey Gubenko, and Liam P. Barry

IEEE Photonics Technology Letters DOI: 10.1109/LPT.2025.3580280 (2025)

IM/DD | Access Networks | Device Characterisation | Digital Signal Processing | Direct Modulation Laser

J13

2× 53 Gbit/s PAM-4 Transmission Using 1.3 μm DML with High Power Budget Enabled by Quantum-Dot SOA

Ahmed Galib Reza, Lakshmi Narayanan Venkatasubramani, Anil Raj Gautam, Prajwal D. Lakshmijayasimha, John O’Carroll, Richard Phelan, Diarmuid Byrne, Brian Kelly, Vladimir S. Mikhrin, Alexey Gubenko, and Liam P. Barry

IEEE Photonics Technology Letters DOI: 10.1109/LPT.2024.3504841 (2024)

IM/DD | Access Networks | Device Characterisation | Digital Signal Processing | Direct Modulation Laser

J12

Joint carrier phase tracking and IQ imbalance tolerance with the dynamic adaption of reference constellation for probabilistic shaped signals

Sameer Ahmad Mir, Lakshmi Narayanan Venkatasubramani, Liam Barry, and Deepa Venkitesh

Applied Optics 63, 7833-7840 (2024)

Coherent Optical Communication | Digital Signal Processing | Probabilistic Constellation Shaping

J11

Experimental demonstration of 480 Gbit/s coherent transmission using a nanosecond switching tuneable laser

Troncoso-Costas, Marcos, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O’Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, and Liam Barry

Optics Communications, 554, p.130164. (2024)

IM/DD | Access Networks | Device Characterisation | Digital Signal Processing | Fast tuneable Laser

J10

Low-complexity algorithms for coherent optical systems with transceiver IQ imbalance

Sameer Ahmad Mir, Lakshmi Narayanan Venkatasubramani, R. David Koilpillai, and Deepa Venkitesh

Optics Express 31, 30305-30318 (2023)

Coherent Optical Communication | Digital Signal Processing | Transceiver Impairments

Bandwidth Re-configurable Wideband QAM-OFDM with Hybrid Integrated InP-Si3N4 Tunable Laser Source for Short-reach Systems

Lakshmi Narayanan Venkatasubramani, Devika Dass, Colm Browning, Chris GH Roeloffzen, Douwe Geuzebroek, and Liam Barry

Journal of Lightwave Technology 41, 3612-3619 (2023)

IM/DD | Access Networks | Data Center Interconnects | Digital Signal Processing | Fast tuneable Laser

Fabry-Perot Optical Frequency Comb based mm-Wave RoF System using Pilot-Assisted Equalizer

Haixuan Xu*, Lakshmi Narayanan Venkatasubramani*, Rangana Banerjee Chaudhuri, Colm Browning, Yonglin Yu, and Liam P. Barry

*- Equally Contributed

Optics Express 31, 30947-30960 (2023)

Microwave Photonics | Radio-over-fiber | Digital Signal Processing | Optical Heterodyning

Widely Linear Filtering for Multiimpairment Compensation in Dispersion Managed mQAM Modulated Optical Systems

Rekha Yadav, Lakshmi Narayanan Venkatasubramani, R. David Koilpillai, and Deepa Venkitesh

IEEE Access, vol. 10, pp. 73278-73293 (2022)

Coherent Optical Communication | Digital Signal Processing | Transceiver Impairments

Optical Phase Conjugation using Nonlinear SOA for Nonlinearity and Dispersion Compensation of Coherent Multi-carrier Lightwave Systems

Lakshmi Narayanan Venkatasubramani, Aneesh Sobhanan, Anirudh Vijay, R. David Koilpillai, and Deepa Venkitesh

IEEE Access, vol. 9, pp. 44059-44068 (2021)

Coherent Optical Communication | Digital Signal Processing | Nonlinear Optics - Optical Signal Processing

Nonlinearity-assisted all-optical clock recovery for phase-modulated lightwave systems

Manas Srivastava, Lakshmi Narayanan Venkatasubramani, Balaji Srinivasan, and Deepa Venkitesh

IEEE Journal of Selected Topics in Quantum Electronics, vol. 27, no. 2, pp. 1-9 (2021)

Coherent Optical Communication | Digital Signal Processing | Nonlinear Optics - Optical Signal Processing

CO-OFDM for Bandwidth-Reconfigurable Optical Interconnects using Gain-Switched Comb

Lakshmi Narayanan Venkatasubramani, Yi Lin, Colm Browning, Anirudh Vijay, Frank Smyth, R. David Koilpillai, Deepa Venkitesh, and Liam P Barry

OSA Continuum 3, 2925-2934 (2020)

Coherent Optical Communication | Digital Signal Processing | Optical Frequency Combs

Dispersion and Nonlinearity Distortion Compensation of the QPSK/16QAM Signals Using Optical Phase Conjugation in Nonlinear SOAs

Aneesh Sobhanan, Lakshmi Narayanan Venkatasubramani, R. David Koilpillai, and Deepa Venkitesh

IEEE Photonics Journal, vol. 12, no. 1, pp. 1-7 (2020)

Coherent Optical Communication | Digital Signal Processing | Nonlinear Optics - Optical Signal Processing

Pilot-free Common Phase Error Estimation for CO-OFDM with Improved Spectral Efficiency

Lakshmi Narayanan Venkatasubramani, Anirudh Vijay, R. David Koilpillai, and Deepa Venkitesh

IEEE Photonics Journal, vol. 11, no. 6, pp. 1-10 (2019)

Coherent Optical Communication | Digital Signal Processing

Polarization-Insensitive Phase Conjugation of QPSK Signal Using Bragg-Scattering FWM in SOA

Aneesh Sobhanan, Lakshmi Narayanan Venkatasubramani, R. David Koilpillai, and Deepa Venkitesh

IEEE Photonics Technology Letters, vol. 31, no. 12, pp. 919-922 (2019)

Coherent Optical Communication | Digital Signal Processing | Nonlinear Optics - Optical Signal Processing