Dr Roger Giddings
Senior Lecturer in Optical Communications & DSP

- Published
Real-time implementation of optical OFDM transmitters and receivers for practical end-to-end optical transmission systems
Giddings, R. P., Jin, X., Kee, H., Yang, X. & Tang, J., 16 Jul 2009, In: Electronics Letters. 45, 15, p. 800-802Research output: Contribution to journal › Article › peer-review
- Published
Real-time optical OFDM and colorless OOFDMA PONs
Tang, J. M., Giddings, R. P., Hugues-Salas, E. & Hong, Y., 2012, p. 1. 1 p.Research output: Contribution to conference › Paper › peer-review
- Published
Real-time optical OFDM transceivers for PON applications
Tang, J. M., Giddings, R. P., Jin, X. Q., Wei, J. L., Zheng, X., Giacoumidis, E., Hugues-Salas, E., Hong, Y., Shu, C., Groenewald, J. & Muthusamy, K., 2011, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
- Published
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
- Published
Record-high and robust 17.125 Gb/s gross-rateover 25 km SSMF transmissions of real-time dual-band optical OFDM signals directly modulated by 1 GHz RSOAs
Zhang, Q. W., Hugues-Salas, E., Ling, Y., Zhang, H. B., Giddings, R. P., Zhang, J. J., Wang, M. & Tang, J. M., 2014, In: Optics Express. 22, 6, p. 6339-6348 10 p.Research output: Contribution to journal › Article › peer-review
- Published
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
- Published
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
- Published
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
- Published
Robust real-time 15.125Gb/s adaptive optical OFDM transmissions over 100m OM2 MMFs utilizing directly modulated VCSELs subject to optical injection locking
Tang, J., Zhang, H. B., Yi, X. W., Zhang, Q. W., Ling, Y., Deng, M. L., Hugues-Salas, E., Giddings, R. P., Hong, Y. & Tang, J. M., 13 Jan 2014, In: Optics Express. 22, 1, p. 1163Research output: Contribution to journal › Article › peer-review
- Published
SOA intensity modulator-enabled colourless transmission of adaptively modulated optical OFDM signals for WDM-PONs
Wei, J. L., Yang, X. L., Giddings, R. P., Tang, J. M. & Shore, K. A., 2009, p. 1-2. 2 p.Research output: Contribution to conference › Paper › peer-review
- Published
Seamless Fiber-Wireless Access Network Convergence with Dynamic O-E-O Conversion-less Sub-Wavelength Switching and Tunable Photonic mmWave Generation
Gonem, O., Vallejo Castro, L., He, J., Giddings, R., Jin, W., Yi, X., Faruk, M. S. & Tang, J., 15 Nov 2024.Research output: Contribution to conference › Paper › peer-review
- E-pub ahead of print
Seamlessly Converged Fiber-Wireless Access Networks with Dynamic Sub-wavelength Switching and Tunable Photonic mmWave Generation
Vallejo Castro, L., Gonem, O., Jin, W., Giddings, R., Chen, L., Huang, Y., Yi, X., Faruk, M. S. & Tang, J., 15 Nov 2024, (E-pub ahead of print) In: Journal of Lightwave Technology.Research output: Contribution to journal › Article › peer-review
- Published
Self-seeding-based 10Gb/s over 25km optical OFDM transmissions utilizing face-to-face dual-RSOAs at gain saturation
Deng, M., Ling, Y., Chen, X., Giddings, R., Hong, Y., Yi, X. W., Qiu, K. & Tang, J., 19 May 2014, In: Optics Express. 22, 10, p. 11954-11965Research output: Contribution to journal › Article › peer-review
- Published
Semiconductor Optical Amplifier-Enabled Intensity Modulation of Adaptively Modulated Optical OFDM Signals in SMF-Based IMDD Systems
Wei, J., Hamie, A., Giddings, R. P. & Tang, J., 15 Aug 2009, In: Journal of Lightwave Technology. 27, 16, p. 3679-3689Research output: Contribution to journal › Article › peer-review
- Published
Significant improvements in optical power budgets of real-time optical OFDM PON systems
Wei, J. L., Sanchez, C., Giddings, R. P., Hugues-Salas, E. & Tang, J. M., Sept 2010, In: Optics Express. 18, 20, p. 20732-20745 14 p.Research output: Contribution to journal › Article › peer-review
- Published
Simple adaptively modulated optical OFDM modems using subcarrier modulation with input/output reconfigurability
Zheng, X., Wei, J. L., Giddings, R. P. & Tang, J. M., Jun 2010, p. 1-8. 8 p.Research output: Contribution to conference › Paper › peer-review
- Accepted/In press
Soft-ROADM-enabled Seamlessly Converged Optical-Wireless Access Networks with Free-Running Laser-based Tunable mmWave Generation and RF Envelope Detection
Vallejo Castro, L., Gonem, O., Jin, W., Giddings, R. & Tang, J., 28 Mar 2024, (Accepted/In press).Research output: Contribution to conference › Paper › peer-review
- Published
Stage-dependent DSP Operation Range Clipping-induced Bit Resolution Reductions of Full Parallel 64-point FFTs Incorporated in FPGA-based Optical OFDM Receivers
Zhang, J., Tang, Z., Giddings, R., Wu, Q., Wang, W., Cao, B., Zhang, Q. & Tang, J. M., 15 Aug 2016, In: Journal of Lightwave Technology. 34, 16, p. 3752-3760Research output: Contribution to journal › Article › peer-review
- Published
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
- Published
Subcarrier Grouping-Enabled Improvement in Transmission Performance of Subcarrier Index-Power Modulated Optical OFDM for IM/DD PON Systems
Al Halabi, F., Chen, L., Giddings, R., Hamie, A. & Tang, J., 15 Oct 2018, In: Journal of Lightwave Technology. 36, 20, p. 4792-4798Research output: Contribution to journal › Article › peer-review
- Published
Subcarrier Index-Power Modulated Optical OFDM (SIPM-OOFDM) for IMDD PON Systems
Tang, J., Halabi, F., Chen, L., Parre, S., Barthomeuf, S., Giddings, R. P. & Aupetit-Berthelemot, C., 22 Jul 2016.Research output: Contribution to conference › Paper › peer-review
- Published
Subcarrier Index-Power Modulated Optical OFDM With Superposition Multiplexing for IMDD Transmission Systems
Chen, L., Al Halabi, F., Giddings, R. & Tang, J., 12 Nov 2016, In: Journal of Lightwave Technology. 34, 22, p. 5284 - 5292Research output: Contribution to journal › Article › peer-review
- Published
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
- Published
Subcarrier Index-Power Modulated-Optical OFDM with Dual Superposition Multiplexing for Directly Modulated DFB-based IMDD PON Systems
Chen, L., Halabi, F., Giddings, R. P., Zhang, J. & Tang, J., Dec 2018, In: IEEE Photonics Journal. 10, 6, 7908113.Research output: Contribution to journal › Article › peer-review
- Published
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
- Published
Technical and Market Feasibility of High-Speed Software-Reconfigurable OOFDM/DFMA-based Optical Transceiversfor Next Generation Access Network PONs
Dorward, R. M., Anderson, M. J. & Giddings, R. P., 25 Aug 2016.Research output: Contribution to conference › Paper › peer-review
- Published
Timing Jitter Analysis and Mitigation in Hybrid OFDM-DFMA PONs
Giddings, R., Gonem, O. & Tang, J., Dec 2021, In: IEEE Photonics Journal. 13, 6, 13 p., 7200313.Research output: Contribution to journal › Article › peer-review
- Published
Tutorial: Real-time digital signal processing for future optical access networks
Giddings, R., 2013, Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013. p. 1-116 116 p.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
- Published
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
- Published
Wavelength reused bidirectional adaptively modulated optical OFDM transmission in colourless WDM-PONs
Wei, J. L., Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Zheng, X. & Tang, J. M., 2010, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
- Published
Wavelength reused bidirectional transmission of adaptively modulated optical OFDM signals in SOA/RSOA intensity modulator-based WDM-PONs
Wei, J. L., Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Zheng, X. & Tang, J. M., Jun 2010, p. 1-9. 9 p.Research output: Contribution to conference › Paper › peer-review
- Published
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
- Published
Wavelength-offset optical filtering induced power budget improvements in end-to-end real-time optical OFDM PON systems
Wei, J. L., Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Pierce, I., Ortega, B. & Tang, J. M., 2012, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review
- Published
World-first experimental demonstration of synchronous clock recovery in an 11.25Gb/s real-time end-to-end optical OFDM system using directly modulated DFBs
Giddings, R. P. & Tang, J. M., 2011, p. 1-3. 3 p.Research output: Contribution to conference › Paper › peer-review