Dr Roger Giddings
Senior Lecturer in Optical Communications & DSP

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Experimental Demonstration of a Dual-Arm Drop Element-Based Soft-ROADM for Future Optical-Wireless Converged Access Networks
Gonem, O., Giddings, R. & Tang, J., 2023, p. 1-5. 5 p.Research output: Contribution to conference › Paper › peer-review
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Subcarrier Index-Power Modulated Optical OFDM and Its Performance in IMDD PON Systems
Halabi, F., Chen, L., Parre, S., Barthomeuf, S., Giddings, R. P., Aupetit-Berthelemot, C., Hamie, A. & Tang, J. M., 1 May 2016, In: Journal of Lightwave Technology. 34, 9, p. 2228-2234 7 p.Research output: Contribution to journal › Article › peer-review
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Subcarrier index-power modulated optical OFDM with dual superposition multiplexing for IMDD PON systems
Halabi, F., Chen, L., Giddings, R. P., Hamie, A., Dumas, Y., Freyssinet, P., Aupetit-Berthelemot, C. & Tang, J. M., 15 Feb 2019, In: Optics Communications. 433, p. 190-194Research output: Contribution to journal › Article › peer-review
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Low-complexity modulation format identification based on am- 2 plitude histogram distributions for digital coherent receivers
Hao, M., Jiang, X., Xiong, X., Giddings, R., He, W. & Tang, J., 20 Apr 2023, In: Photonics.Research output: Contribution to journal › Article › peer-review
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Adaptive Hybrid Iterative Linearization Algorithms for IM/DD Optical Transmission Systems
Hu, S., Zhang, J., Tang, J., Jin, T., Lin, H., Jin, W., Yu, Z., Giddings, R. & Qiu, K., 15 Jul 2023, In: Journal of Lightwave Technology. 41, 14, p. 4644-4654 11 p.Research output: Contribution to journal › Article › peer-review
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112-Gb/s PAM-4 IM/DD Optical Transmission over 100-km Single Mode Fiber with Linear Equalizer
Hu, S., Zhang, J., Tang, J., Liu, Q., Jin, W., Zhong, Z., Giddings, R., Shao, J., Jin, T., Zhao, X., Xu, B., Gao, X. & Qiu, K., 13 Apr 2022, 2022 Optical Fiber Communications Conference and Exhibition (OFC). IEEEResearch output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
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Multi-Constraint Gerchberg-Saxton Iteration Algorithms for Linearizing IM/DD Transmission Systems
Hu, S., Zhang, J., Tang, J., Jin, T., Jin, W., Liu, Q., Zhong, Z., Giddings, R., Hong, Y., Xu, B., Yi, X. & Qiu, K., 14 Mar 2022, In: Optics Express. 30, 6, p. 10019-10031 13 p.Research output: Contribution to journal › Article › peer-review
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Data-aided Iterative Algorithms for Linearizing IM/DD Optical Transmission Systems
Hu, S., Zhang, J., Tang, J., Jin, W., Giddings, R. & Qiu, K., 1 May 2021, In: Journal of Lightwave Technology. 39, 9, p. 2864 - 2872 9 p.Research output: Contribution to journal › Article › peer-review
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First experimental demonstration of real-time adaptive transmission of 20Gb/s dual-band optical OFDM signals over 500m OM2 MMFs
Hugues-Salas, E., Giddings, R. P. & Tang, J. M., 2013, Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013. p. 1-3 3 p.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
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Record-high and robust capacity versus reach performance of adaptive real-time dual-band optical OFDM signals for upgrading legacy MMF systems
Hugues-Salas, E., Zhang, Q. W., Giddings, R. P., Wang, M. & Tang, J. M., 2013, Future Network and Mobile Summit (FutureNetworkSummit), 2013. p. 1-10 10 p.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
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Adaptability-enabled record-high and robust capacity-versus-reach performance of real-time dual-band optical OFDM signals over various OM1/OM2 MMF systems invited]
Hugues-Salas, E., Zhang, Q., Giddings, R. P., Wang, M. & Tang, J., 2013, In: IEEE Journal of Optical Communications and Networking. 5, 10, A1-A11.Research output: Contribution to journal › Article › peer-review
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REAM intensity modulator-enabled colorless transmission of real-time optical OFDM signals for WDM-PONs
Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Quinlan, T., Hong, Y., Walker, S. & Tang, J. M., 2012, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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Real-time 11.25Gb/s optical OFDM transmission over 2000m legacy MMFs utilizing directly modulated VCSELs
Hugues-Salas, E., Courjault, N., Jin, X. Q., Giddings, R. P., Aupetit-Berthelemot, C. & Tang, J. M., 2012, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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First experimental demonstration of VCSEL-based realtime end-to-end 11.25Gb/s optical OFDM signal transmission over 800m MMFs
Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Wei, J. L., Shu, C. & Tang, J. M., 2011, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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Real-time experimental demonstration of low-cost VCSEL intensity-modulated 11.25Gb/s optical OFDM signal transmission over 25km PON systems
Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Wei, J. L., Zheng, X., Hong, Y., Shu, C. & Tang, J., 1 Feb 2011, In: Optics Express. 19, 4, p. 2979-2988Research output: Contribution to journal › Article › peer-review
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First experimental demonstration of low-cost VCSEL-intensity modulated end-to-end real-time optical OFDM signal transmission at 11.25Gb/s over 25km SSMFs
Hugues-Salas, E., Giddings, R. P., Hong, Y., Jin, X. Q., Wei, J. L., Zheng, X. & Tang, J. M., 2011, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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REAM intensity modulator-enabled 10Gb/s colorless upstream transmission of real-time optical OFDM signals in a single-fiber-based bidirectional PON architecture
Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Hong, Y., Quinlan, T., Walker, S. & Tang, J. M., 2012, In: Optics Express. 20, 19, p. 21089-21100 12 p.Research output: Contribution to journal › Article › peer-review
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Real-time 11.25Gb/s optical OFDM signal transmission over 2000m legacy MMFs using centre launching
Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Hong, Y., Mansoor, S., Villafranca, A. & Tang, J. M., 2012, p. 1-8. 8 p.Research output: Contribution to conference › Paper › peer-review
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Experimental Demonstrations of Hybrid OFDM-Digital Filter Multiple Access PONs
Jin, W., Zhong, Z., He, J., Sankoh, A., Giddings, R., Hong, Y., Pierce, I., O'Sullivan, M., Laperle, C., Lee, J., Mariani, G., Durrant, T. & Tang, J., 1 Jul 2020, In: IEEE Photonics Technology Letters. 32, 13, p. 751-754Research output: Contribution to journal › Article › peer-review
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Improved Performance Robustness of DSP-Enabled Flexible ROADMs Free from Optical Filters and O-E-O Conversions
Jin, W., Zhang, C., Duan, X., Kadhum, M. R., Dong, Y. X., Giddings, R. P., Jiang, N., Qiu, K. & Tang, J. M., 1 Aug 2016, In: IEEE Journal of Optical Communications and Networking. 8, 8, p. 521-529 9 p.Research output: Contribution to journal › Article › peer-review
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Rectangular Orthogonal Digital Filter Banks Based on Extended Gaussian Functions
Jin, W., Zhong, Z., Jiang, S., He, J., Chang, D., Hong, Y., Giddings, R., Jin, X., O'Sullivan, M., Durrant, T., Trewem, J., Mariani, G. & Tang, J., 15 Jun 2022, In: Journal of Lightwave Technology. 40, 12, p. 3709-3722Research output: Contribution to journal › Article › peer-review
- E-pub ahead of print
Concurrent Direct Inter-ONU and Upstream Communications in IMDD PONs Incorporating P2MP Flexible Optical Transceivers and Advanced Passive Remote Nodes
Jin, W., Chen, L., He, J., Giddings, R., Huang, Y., Hao, M., Faruk, M. S., Yi, X., Wang, T. & Tang, J., 30 Oct 2024, (E-pub ahead of print) In: Photonics. 11, 11, 1021.Research output: Contribution to journal › Article › peer-review
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Hybrid SSB OFDM-Digital Filter Multiple Access PONs
Jin, W., Sankoh, A., Dong, Y., Giddings, R., O'Sullivan, M., Durrant, T., Lee, J. & Tang, J., 15 Apr 2020, In: Journal of Lightwave Technology. 38, 8, p. 2095 - 2105Research output: Contribution to journal › Article › peer-review
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Experimental Demonstrations of Point-to-Multipoint Flexible Optical Transceiver-Enabled Concurrent Direct Inter-ONU and Upstream Communications in IMDD PONs
Jin, W., Chen, L., He, J., Giddings, R., Hao, M. & Tang, J., 1 Jan 2024.Research output: Contribution to conference › Paper › peer-review
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Experimental demonstrations of DSP-enabledflexibility, adaptability and elasticity ofmulti-channel >72Gb/s over 25 km IMDDtransmission systems
Jin, W., Zhong, Z., Jiang, S., He, J., Hu, S. H., Chang, D., Giddings, R., Hong, H., Jin, X., O'Sullivan, M., Durrant, T., Trewern, J., Mariani, G. & Tang, J., 30 Nov 2021, In: Optics Express. 29, 25, p. 41363-41377Research output: Contribution to journal › Article › peer-review
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Dependence of upstream power budget on the number of ONUs in IMDD optical OFDMA PONs
Jin, X. Q., Groenewald, J., Hugues-Salas, E., Giddings, R. P. & Tang, J. M., 2013, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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First experimental demonstration of end-to-end real-time optical OFDM symbol synchronization using subtraction and Gaussian windowing in 25km SMF IMDD systems
Jin, X. Q., Giddings, R. P., Hugues-Salas, E. & Tang, J. M., 2010, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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Experimental demonstration of adaptive bit and/or power loading for maximising real-time end-to-end optical OFDM transmission performance
Jin, X. Q., Giddings, R. P. & Tang, J. M., 2011, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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Upstream Power Budgets of IMDD Optical OFDMA PONs Incorporating RSOA Intensity Modulator-Based Colorless ONUs
Jin, X. Q., Groenewald, J., Hugues-Salas, E., Giddings, R. P. & Tang, J. M., 2013, In: Journal of Lightwave Technology. 31, 12, p. 1914-1920 7 p.Research output: Contribution to journal › Article › peer-review
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End-to-end real-time demonstration of 128-QAM-encoded optical OFDM transmission with a 5.25bit/s/Hz spectral efficiency over IMDD systems
Jin, X. Q., Giddings, R. P., Hugues-Salas, E. & Tang, J. M., 2010, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
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Real-Time 3Gb/s 16QAM-Encoded Optical OFDM Transmission over 75km MetroCor SMFs with Negative Power Penalties.
Jin, X. Q., Giddings, R. P., Tang, J. M. & Shore, K. A., 1 Jan 2009.Research output: Contribution to conference › Paper
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Error-Controlled Iterative Algorithms for Digital Linearization of IMDD-based Optical Fibre Transmission Systems
Jin, X., Jin, W., Zhong, Z., Jiang, S., Raibhjandari, S., Hong, Y., Giddings, R. & Tang, J., 18 Jul 2022, In: Journal of Lightwave Technology.Research output: Contribution to journal › Article › peer-review
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Improvement in Convergence Rate and Power Penalty with an Error-Controlled Iterative Algorithm in IMDD Systems
Jin, X., Jin, W., Zhong, Z., Jiang, S., Rajbhandari, S., Hong, Y., Giddings, R. & Tang, J., 2022, p. 1-2. 2 p.Research output: Contribution to conference › Paper › peer-review
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Real-time transmission of 3Gb/s 16-QAM encoded optical OFDM signals over 75km SMFs with negative power penalties
Jin, X., Tang, J. & Giddings, R., 17 Aug 2009, In: Optics Express. 17, 17, p. 14574-14585Research output: Contribution to journal › Article › peer-review
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17.125Gb/s over 25km transmissions of real-time dual-band optical OFDM signals modulated by 1GHz RSOAs
Lin, L. Y., Giddings, R. P., Tang, J., Zhang, Q., Salas, E. H., Ling, Y., Zhang, H., Giddings, R. & Wang, M., 9 Mar 2014.Research output: Contribution to conference › Paper
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Directly Modulated VCSEL-Based Real-Time 11.25-Gb/s Optical OFDM Transmission Over 2000-m Legacy MMFs
Mansoor, S. P., Tang, J., Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Hong, Y., Mansoor, S., Villafranca, A. & Tang, J. M., 1 Feb 2012, In: IEEE Photonics Journal. 4, 1, p. 143-154Research output: Contribution to journal › Article › peer-review
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DSP-enabled reconfigurable and transparent spectral converters for converging optical and mobile fronthaul/backhaul networks
Mao, M. Z., Giddings, R., Cao, B. Y., Xu, Y. T., Wang, M. & Tang, J., 9 Jun 2017, In: Optics Express. p. 13836-13856Research output: Contribution to journal › Article › peer-review
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DFT-Spread Spectrally Overlapped Hybrid OFDM-Digital Filter Multiple Access IMDD PONs
Sankoh, A., Jin, W., Zhong, Z., He, J., Hong, Y., Giddings, R. & Tang, J., 2 Sept 2021, In: Sensors. 21, 17, 5903.Research output: Contribution to journal › Article › peer-review
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Hybrid OFDM-Digital Filter Multiple Access PONs Utilizing Spectrally Overlapped Digital Orthogonal Filtering
Sankoh, A., Jin, W., Zhong, Z., He, J., Hong, Y., Giddings, R., Pierce, I., O'Sullivan, M., Lee, J., Durrant, T. & Tang, J., Oct 2020, In: IEEE Photonics Journal. 12, 5, 10 p., 7905311.Research output: Contribution to journal › Article › peer-review
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Robust and tunable 16.375Gb/s dual-band optical OFDM transmissions over directly modulated VCSEL-based 200m OM2 MMFs
Tang, J., Deng, M. L., Jiang, N., Duan, X., Giddings, R. P., Yi, X. W., Cao, B. Y., Mansoor, S. P., Qiu, K. & Tang, J. M., 8 Jan 2015, In: Optics Express. 23, 1, p. 373-383Research output: Contribution to journal › Article › peer-review
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Experimental demonstration and optimisation of a synchronous clock recovery technique for real-time end-to-end optical OFDM transmission at 11.25Gb/s over 25km SSMF
Tang, J., Giddings, R. P. & Tang, J. M., 28 Jan 2011, In: Optics Express. 19, 3, p. 2831-2845Research output: Contribution to journal › Article › peer-review
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Digital Orthogonal Filter-Enabled Optical OFDM Channel Multiplexing for Software-Reconfigurable Elastic PONs
Tang, J., Bolea, M., Giddings, R. P. & Tang, J. M., 16 Jan 2014, In: Journal of Lightwave Technology. 32, 6, p. 1200-1206Research output: Contribution to journal › Article › peer-review
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First experimental demonstration of 6Gb/s real-time optical OFDM transceivers incorporating channel estimation and variable power loading.
Tang, J., Giddings, R. P., Jin, X. Q. & Tang, J. M., 1 Oct 2009, In: Optics Express. 17, 22, p. 19727-19738Research output: Contribution to journal › Article › peer-review
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Stage-dependent minimum bit resolution maps of full-parallel pipelined FFT/IFFT architectures incorporated in real-time optical orthogonal frequency division multiplexing transceivers
Tang, J., Zhang, J., Yuan, W., Wang, K., Cao, B., Giddings, R. P., Wang, M. & Tang, J. M., 27 Aug 2014, In: Journal of Engineering. 2014, p. 1-8Research output: Contribution to journal › Article › peer-review
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Wavelength reused bidirectional transmission of adaptively modulated optical OFDM signals in WDM-PONs incorporating SOA and RSOA intensity modulators.
Tang, J., Wei, J. L., Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Zheng, X., Mansoor, S. P. & Tang, J. M., 10 May 2010, In: Optics Express. 18, 10, p. 9791-9808Research output: Contribution to journal › Article › peer-review
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13.625 Gb/s real-time dual-band adaptive optical orthogonal frequency division multiplexing transmissions over 25 km standard single-mode fibre intensity modulation and direct detection systems utilising strongly saturated reflective semiconductor optical amplifier intensity modulators
Tang, J., Zhang, Q., Hugues-Salas, E., Giddings, R. P., Zhang, J., Wang, M. & Tang, J. M., 1 Oct 2014, In: IET Optoelectronics. 8, 5, p. 175-180Research output: Contribution to journal › Article › peer-review
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Intra-Cavity Chromatic Dispersion Impacts on 10-Gb/s Optical OFDM Transmissions Over 25-km Dual-RSOA-Based Self-Seeded PON Systems
Tang, J., Deng, M. L., Cao, B. Y., Giddings, R. P., Dong, Y. X., Jiang, N., Nesset, D., Qiu, K. & Tang, J. M., 18 Dec 2014, In: IEEE Photonics Journal. 7, 1Research output: Contribution to journal › Article › peer-review
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RSOA Intensity Modulator Frequency Chirp-Enabled 40Gb/s over 25km IMDD PON Systems
Tang, J., Giddings, R. P., Tang, J. M., Cao, B., Deng, M., Giddings, R., Duan, X., Zhang, Q. & Wang, M., 22 Mar 2015.Research output: Contribution to conference › Paper
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Adaptively modulated optical OFDM modems utilizing RSOAs as intensity modulators in IMDD SMF transmission systems.
Tang, J., Wei, J. L., Hamie, A., Giddings, R. P., Hugues-Salas, E., Zheng, X., Mansoor, S. P. & Tang, J. M., 8 Apr 2010, In: Optics Express. 18, 8, p. 8556-8573Research output: Contribution to journal › Article › peer-review
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Experimental demonstration of real-time 3Gb/s optical OFDM transceivers.
Tang, J., Giddings, R. P., Jin, X. Q. & Tang, J. M., 14 Sept 2009, In: Optics Express. 17, 19, p. 16654-16665Research output: Contribution to journal › Article › peer-review