I am an Associate Research Scientist at Professor Keren Bergman's Lightwave Research Laboratory. My research interests bridge network architecture, data science, and optical interconnects. I am specifically interested in leveraging emerging optical technologies along with data analytics techniques to design high performance and energy efficient Telecom and Datacom networks.
samadi(@)ee(.)columbia(.)edu

Current Projects


Reconfigurable and Intelligent Optical Networks

In network research there is a gap between physical, network, and application layers research studies. This disconnect has resulted in a static physical layer and inefficient network resource utilization. We have addressed this issue with cross-layer and software-defined networking approaches in network architectural designs that provide a flexible physical layer, as well as network data collection and analysis that enables cognitive networking.


Data analytics techniques for network resource allocation

Introducing flexibility and dynamism in the network physical layer requires careful consideration of stability, contention, and routing. We propose a unique approach to resolve this problem by leveraging data analytics techniques on the historical signal quality data to predict optimal solutions during reconfigurations.


Application of optical interconnects in Datacom networks

Data centers and high performance computing platforms face a critical energy consumption challenge. Improving the energy efficiency of these systems is crucial for continued scaling so that we can meet growing bandwidth demands. Our approach to improve the energy efficiency is the use of adaptive network optimization based on the application and traffic requirements along with optical interconnects with their high bandwidth density and low energy consumption, within and between the nodes.

Collaborations


Research Centers:

  • Center for Integrated Access Networks (CIAN)

  • American Institute for Manufacturing Integrated (AIM) Photonics

  • Sandia National Laboratories

Companies:

  • Microsoft Research

  • Nvidia

  • Calient Technologies

  • Juniper Networks

  • Polatis


Universities:

  • College of Optics, University of Arizona

  • Wireless and Mobile Networking Lab (WimNet), Columbia University

  • KTH Royal Institute of Technology

  • Télécom SudParis

  • University of California, Santa Barbara

Publications


Adaptive and Intelligent Optical Networks:

  1. P. Samadi, M. Fiorani, Y. Shen, L. Wosinska, K. Bergman, "Flexible Architecture and Autonomous Control Plane for Metro-scale Geographically Distributed Data Centers[Invited]," submitted to IEEE Journal of Lightwave Technology (2016).

  2. M. Fiorani, P. Samadi, Y. Shen, L. Wosinska, K. Bergman, "Flexible Network Architecture and Provisioning Strategy for Geographically Distributed Metro Data Centers," submitted to Journal of Communications and Networking (JOCN) (2016).

  3. Y. Huang, C. L. Gutterman, P. Samadi, P. B. Cho, W. Samoud, C. Ware, M. Lourdiane, G. Zussman, K. Bergman, " Mitigation of EDFA power excursions with machine learning in dynamic networks," submitted to OSA Optics Express (2016).

  4. P. Samadi, M. Fiorani, Y. Shen, L. Wosinska, K. Bergman, "Self-Adaptive, Multi-Rate Optical Network for Geographically Distributed Metro Data Centers," Optical Fiber Communications Conference (OFC) W3D.2 (Aug. 2017).

  5. Y. Huang, P. Cho, P. Samadi, K. Bergman, “Dynamic Power Pre-adjustments with Machine Learning that Mitigate EDFA Excursions during Defragmentation,” Optical Fiber Communications Conference (OFC) Th1J.2 (Aug. 2017).

  6. M. Fiorani, P. Samadi, Y. Shen, L. Wosinska, K. Bergman, "Flexible Architecture and Control Strategy for Metro-Scale Networking of Geographically Distributed Data Centers [Highest Scored Paper]," European Conference on Optical Communications (ECOC) (Sep. 2016).

  7. Y. Huang, W. Samoud, C. L. Gutterman, C. Ware, M. Lourdiane, G. Zussman, P. Samadi, K. Bergman, "A Machine Learning Approach for Dynamic Optical Channel Add/Drop Strategies that Minimize EDFA Power Excursions," European Conference on Optical Communication (Sep. 2016).

  8. P. Samadi, K. Wen, J. Xu, K. Bergman, "Software-defined optical network for metro-scale geographically distributed data centers," Optics Express 24 (11) (May 2016).

  9. P. Samadi, J. Xu, K. Wen, H. Guan, Z. Li, K. Bergman, "Experimental Demonstration of Converged Inter/Intra Data Center Network Architecture," 17th International Conference on Transparent Optical Networks ICTON 2015 (Jul. 2015).

  10. P. Samadi, H. Guan, K. Wen, K. Bergman, "A Software-Defined Optical Gateway for Converged Inter/Intra Data Center Networks," IEEE Optical Interconnects Conference (Apr. 2015).

  11. P. Samadi, J. Xu, K. Bergman, "Virtual Machine Migration over Optical Circuit Switching Network in a Converged Inter/Intra Data Center Architecture," Optical Fiber Communication (OFC) Th4G.6 (Mar. 2015).


Optical Interconnects for Datacom Networks:

  1. A. Gazman, C. Browning, M. Bahadori, Z. Zhu, P. Samadi, S. Rumley, V. Vujicic, L. P. Barry, K. Bergman, “Software-Defined Wavelength Selective Unicast and Multicast of Optical Data in a Silicon Photonic Platform,” submitted to OSA Optics Express (2016).

  2. K. Wen, S. Rumley, P. Samadi, C. P. Chen, K. Bergman, "Silicon Photonics in Post Moore's Law Era: Technological and Architectural Implications," Post-Moore's Era Supercomputing (PMES) Workshop (Nov. 2016).

  3. K. Wen, P. Samadi, S. Rumley, C. P. Chen, Y. Shen, M. Bahadori, J. Wilke, K. Bergman, "Flexfly: Enabling a Reconfigurable Dragonfly Through Silicon Photonics," [Best Student Paper Award] The International Conference for High Performance Computing, Networking, Storage and Analysis (SC) (Nov. 2016).

  4. P. Samadi, K. Wen, J. Xu, Y. Shen, K. Bergman, "Reconfigurable Optical Dragonfly Architecture for High Performance Computing," Optical Fiber Communication (OFC) Th2A.60 (Mar. 2016).

  5. P. Samadi, J. Xu, K. Bergman, "Experimental Demonstration of One-to-Many Virtual Machine Migration by Reliable Optical Multicast," European Conference on Optical Communications (ECOC) 689 (Sep. 2015).

  6. P. Samadi, V. Gupta, J. Xu, H. Wang, G. Zussman, K. Bergman, "Optical multicast system for data center networks," Optics Express 23 (17) 22162-22180 (Aug. 2015).

  7. D. Nikolova, S. Rumley, D. M. Calhoun, Q. Li, R. Hendry, P. Samadi, K. Bergman, "Scaling Silicon Photonic Switch Fabrics for Data Center Interconnection Networks," Optics Express 23 (2) pp.1159- 1175 (Jan. 2015).

  8. P. Samadi, V. Gupta, B. Birand, H. Wang, R. Jensen, G. Zussman, K. Bergman, "SoftwareAddressable Optical Accelerators for Data-Intensive Applications in Cluster-Computing Platforms," European Conference on Optical Communications (ECOC) 0601 (Sep. 2014).

  9. P. Samadi, V. Gupta, B. Birand, H. Wang, G. Zussman, K. Bergman, "Accelerating Incast and Multicast Traffic Delivery for Data-intensive Applications using Physical Layer Optics," SIGCOMM Poster 89 (Aug. 2014).

  10. P. Samadi, H. Wang, D. M. Calhoun, Y. Xia, K. Sripanidkulchai, T. S. Eugene Ng, K. Bergman, "An Optical Programmable Network Architecture Supporting Iterative Multicast for Data-intensive Applications," IEEE Optical Interconnects Conference TuD3 (May 2014).


Optical Signal Processing:

  1. P. Samadi, L. R. Chen, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Shia, "Reconfigurable OTDM Demultiplexing Using FWM in Highly Nonlinear Fiber and a Tunable Planar Lightwave Circuit," IEEE Photonic Technology Letters, (Jan. 2012).

  2. P. Samadi, L. R. Chen, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Xia, "RF Arbitrary Waveform Generation using Tunable Planar Lightwave Circuits," Elsevier Journal of Optics Communications (Mar. 2011).

  3. P. Samadi, L. R. Chen, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Xia, "Reconfigurable Time-Domain De-multiplexing of Optical Signals at 40 Gb/s," Optical Fiber Communications Conference (OFC) (Mar. 2011).

  4. P. Samadi, I. A. Kostko, A. Jain, C. L. Callender, P. Dumais, S. Jacob, L. R. Chen, "Tunable LatticeForm Mach-Zehnder Interferometer for Arbitrary Binary Code Generation at 40 GHz," IEEE Journal of Lightwave Technology (Nov. 2010).

  5. P. Samadi, L. R. Chen, C. L. Callender, P. Dumais, S. Jacob, D. Celo, "Photonically-Assisted RF Waveform Generation Using Planar Lightwave Circuits," IEEE 23rd Annual Photonics Society Meeting (Nov. 2010).

  6. P. Samadi, L. R. Chen, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Shia, "Generating 4x20 GHz and 4x40 GHz Pulse Trains from a Single 10-GHz Mode-Locked Laser Using a Tunable Planar Lightwave Circuit," IEEE Photonic Technology Letters (Mar. 2010).

  7. . P. Samadi, L. R. Chen, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Xia, " Generating 20 GHz and 40 GHz Pulse Trains from a 10 GHz Mode-Locked Laser Using a Tunable Planar Lightwave Circuit and Nonlinear Wavelength," Optical Fiber Communications Conference (OFC) (Mar. 2010).

  8. Y. K. Lize, JC Richard, P. Samadi, and L. R. Chen, “Polarization Dependent Formalism of Interferometric Structures Describing DPSK and DQPSK Receivers," IEEE CLEO (May 2010).

  9. P. Samadi, I. A. Kostko, P. Dumais, C. L. Callender, S. Jacob, B. Xia, "Tunable 6-Stage Lattice-form Mach-Zehnder Interferometer for Arbitrary Binary Code Generation at 40 GHz," Optical Fiber Communications Conference (OFC) (Mar. 2009).

  10. C. L. Callender, P. Dumais, S. Jacob, C. Blanchetière, C. Ledderhof, P. Samadi, L. R. Chen, "Tunable Silica-on-Silicon Planar Lightwave Circuits for Signal Processing Applications," Photonics North (May 2009).


Digital Signal Processing and Evolutionary Computing:

  1. P. Samadi, M. Ahmadi, "Common Subexpression Elimination Using Genetic Algorithm," IEEE International Conference on Electronics, Circuits, and Systems 2007, Marrakech, Morocco.

  2. P. Samadi, M. Ahmadi, "Genetic Algorithm and Its Application for the Design of QMF Banks with Canonical Signed Digit Coefficients: A Comparative Study and New Results," IEEE 14th International Midwest Symposium on Circuits and Systems (Dec. 2007).

  3. P. Samadi, M. Ahmadi, “Performance Analysis of Genetic Algorithm for the Design of Linear Phase Digital Filters with CSD Coefficients,” 3rd International Conference on Natural Computation (Aug. 2007).

  4. P. Samadi, H. Wu, M. Ahmadi, "2-D Quantized DCT with Distributed Arithmetic," IEEE CCECE (May 2006).

  5. P. Samadi, M. H. Savoji, “A New Wavelet Packet Based Codec for Audio and High quality Speech Using Variable Length Segments and Simultaneous and Temporal Noise Masking Effects,” ICSPC (Jul. 2005).