Douglas L. Richards is an expert in fiber-optic telecommunications with over 15 publications and patents granted. He has worked at Sprint developing their next generation ultra-fast 40/100G express overlay network and coherent optical network architecture. His background includes extensive research in polarization mode dispersion and development of physical layer testing technologies.

1. Douglas L. Richards
5501 W. 162nd St., Stilwell, Kansas 66085 ● H: 913- 851-7524● M: 913-461-9403● Doug.L.Richards@icloud.com
PUBLICATIONS AND PATENT WORK
REFEREED JOURNAL ARTICLES
1. Jiang, J, D. Richards, S. Oliva, P. Green and R. Hui, “PMD and PDL monitoring of a traffic-carrying transatlantic
fiber-optic system,” Electronics Letters, Vol. 45, No. 2, pp. 53-54, 2009.
2. Jiang, J., S. Sundhararajan, D. Richards, S. Oliva, R. Hui, “PMD monitoring in traffic-carrying optical systems and
its statistical analysis,” Optics Express, Vol. 16, Issue 18, pp. 14057—14063, 2008.
3. Jiang, J., D. Richards, C Allen, S. Oliva, and R. Hui, “Non-intrusive polarization dependent loss monitoring in fiber-
optic transmission systems,” Optics Communications, Vol. 281, pp. 4631-4633, 2008.
4. Hui, R., R. Saunders, B. Heffner, D. Richards, B. Fu, and P. Adany, “Non-blocking PMD monitoring in live optical
systems,” Electronics Letters, Vol. 43, No. 1, pp. 53-54, January 4, 2007.
5. Kondamuri, P.K., C.T. Allen, and D.L. Richards "Laplacian pdf of DGD time derivative and application to
predicting PMD-induced outage rates," Electronics Letters, 40 (8), pp. 503-504, April 15, 2004.
6. Allen, C.T., P.K. Kondamuri, D.L. Richards, and D.C. Hague, “Measured temporal and spectral PMD
characteristics and their implications for network-level mitigation approaches,” Journal of Lightwave Technology,
21(1), pp. 79-86, 2003.
7. Hui, R., B. Zhu, R. Huang, C. Allen, K. Demarest, and D. Richards, "Subcarrier multiplexing for high-speed optical
transmission," Journal of Lightwave Technology, Vol. 20, No. 3, pp. 417-427, March 2002.
8. Hui, R., B. Zhu, R. Huang, C. Allen, K. Demarest, and D. Richards, "10-Gb/s SCM fiber system using optical SSB
modulation," IEEE Photonics Technology Letters, Vol. 13, No. 8, pp. 896-898, August 2001.
9. Richards, D.L., R.E. Davies, and J.L. Boone, "A Selective Pt-CdS Photodiode to Monitor Erythemal Flux," J.
Photochemistry and Photobiology B: Biology, 47(1), pp. 22-30, November 1998.
OTHER REFEREED PAPERS
1. Richards, D., C. Allen, K. Demarest, and R. Hui, "Legacy fiber meets long-haul network needs," WDM Solutions, pp.
14-17, March/April 2003.
REFEREED CONFERENCE PAPERS
1. Jiang, J, D. Richards, S. Oliva, P. Green and R. Hui, “In-situ monitoring of PMD and PDL in a traffic-carrying
transatlantic fiber-optic system,” Optical Fiber Communications (OFC) Conference, San Diego, CA, March 2009.
2. Jiang, J., S. Sundhararajan, D. Richards, S. Oliva, M. O’Sullivan, and R. Hui, “PMD Monitoring in Traffic-carrying
Optical Systems,” European Conference on Optical Communication (ECOC), Brussels, Belgium, September 2008.

2. Douglas L. Richards
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3. Heffner, B., T. Schmidt, R. Saunders, R. Hui, D. Richards, G. Nicholl, "43Gb/s Adaptive Polarization Mode
Dispersion Compensator Field Trial," National Fiber Optic Engineers Conference (NFOEC), Anaheim, CA, March
2007.
4. Kondamuri, P., C.T. Allen and D.L. Richards, "Variation of PMD-induced outage rates and durations with fiber
length on buried standard single-mode fibers," Optical Fiber Communication (OFC) Conference, Anaheim, CA,
March 2005.
5. Kondamuri, P., C.T. Allen, and D. Richards, “Study of variation of the Laplacian parameter of DGD time derivative
with fiber length using measured DGD data,” Symposium on Optical Fiber Measurements (SOFM), Boulder, CO, pp.
91-94, September 2004.
6. Richards, D., C. Allen, and D. Hague, "DWDM system identification of a PMD-induced event: cost effective event
labeling," National Fiber Optic Engineers Conference (NFOEC), Orlando, FL, September 2003.
7. Richards, D. and J. Byrne, "A Fully Integrated Test Drive Transmitter for Continuity and BER Testing of DWDM
Circuits," National Fiber Optic Engineers Conference (NFOEC), Orlando, FL, September 2003.
8. Armstrong, J., T. Breaux, J. Nikolopolous, D. Richards, J. Black and M. Jones, “Practical Optical Performance
Measurements for Operation and Maintenance of an All-Optical Network,” National Fiber Optic Engineers
Conference (NFOEC), Orlando, FL, September 2003.
9. Richards, D., G. Wolfe, K. Hansen and M. Gilmour, “Reducing the Cost of a Remote Turn-up and Maintenance Test
System,” National Fiber Optic Engineers Conference (NFOEC), Orlando, FL, September 2003.
10. Allen, C., P.K. Kondamuri, D.L. Richards, and D.C. Hague, "Analysis and comparison of measured DGD data on
buried single-mode fibers," Symposium on Optical Fiber Measurements (SOFM), Boulder, CO, pp. 195-198,
September 2002.
11. Demarest, K., D. Richards, C. Allen, and R. Hui, "Is standard single-mode fiber the fiber to fulfill the needs of
tomorrow's long-haul networks?," National Fiber Optic Engineers Conference (NFOEC), Dallas, TX, pp. 939-946,
September 2002.
12. Allen, C., P. K. Kondamuri, D.L. Richards, and D.C. Hague, “Measured temporal and spectral PMD characteristics
and their implications for network-level mitigation approaches,” Proceedings of the IASTED International
Conference on Wireless and Optical Communications, Banff, Alberta, Canada, pp. 713-720, 2002.
13. Hui, R., B. Zhu, R. Huang, C. Allen, K. Demarest, and D. Richards, “10 Gb/s SCM system using optical single side-
band modulation,” Optical Fiber Communications (OFC) Conference, Anaheim, California, March 2001.
PANEL PRESENTATIONS
1. Richards, D., “Sprint’s Network Vision Introduces an Ultra-Fast 40/100G Express Overlay Network,” OFC/NFOEC
2012 Panel Discussion “Latency De-Mystified.”
U.S. PATENTS GRANTED
1. Jiang, J., R. Hui, D.L. Richards, and S.A. Oliva, “Measurement of Polarization Dependent Loss in an Optical
Transmission System,” U.S. Patent 8,059,958, issued November 15, 2011.

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2. Oliva, S. and D.L. Richards, “Systems and Methods for generation of Communications Channel Fault Information,"
U.S. Patent 7,788,547, issued August 31, 2010.
3. Richards, D.L., “Systems and Methods for Testing a Circuit in a Communication Network,” U.S. Patent 7,394,980,
issued July 1, 2008.
4. Richards, D.L., C.T. Allen, D.C. Hague, and M.L. Jones, "Identification of polarization-mode dispersion on a
communication network," U.S. Patent 7,221,871, issued May 22, 2007.
5. Richards, D.L., “Systems and Methods for Testing a Circuit in a Communication Network,” European Patent
1554821B, issued March, 7, 2007.
6. Richards, D.L., D. Williams and F. Yarkosky, “Arrangement and Method for Testing Fiber Optic
Telecommunications Circuits over Dense Wavelength Division Multiplexing (DWDM),” U.S. Patent 6,907,196,
issued June 14, 2005.
7. Richards, D.L., G.A. Wolfe, and K.H. Hansen, “Testing a Communication Network with a Shared Test Port,” U.S.
Patent 6,879,827, issued April 12, 2005.
8. Richards, D.L., C.T. Allen, and D.C. Hague, "Identifying a polarization-mode dispersion event," U.S. Patent
6,781,679, Issued August 24, 2004.
9. Richards, D.L., D. Williams and F. Yarkosky, “Arrangement and Method for Testing Fiber Optic
Telecommunications Circuits over Dense Wavelength Division Multiplexing (DWDM),” U.S. Patent 6,778,778,
issued August 17, 2004.
PATENTS PENDING
1. Ray, A., D. Richards, R. Butler, “System and Procedure to Reduce the Power Consumption of a Mobile Device
Through Automated Disabling of RF Filters, Docket No. 9474, September 2013.
FOREIGN PATENTS GRANTED
1. Richards, D.L., C.T. Allen, D.C. Hague, and M.L. Jones, "Identification of polarization-mode dispersion on a
communication network," United Kingdom 2404295B, June 14, 2006.
2. Richards, D.L., G. Wolfe and K. Hansen, "Testing a Communication Network with a Shared Test Port," United
Kingdom 2412816, March 29, 2006.
SELECTED SPRINT DOCUMENTS
1. Richards, D., et al, “Repurposing Underutilized Core Backbone Fibers and Facilities: Estimating the Cost of Dark
Fiber, Building Facilities and Power Across the Core Network,” April 2014.
2. Richards, D. and R. Butler, “Sprint’s Coherent Optical Network: OXC/ROADM Architecture,” August 2013.
3. Norris, J., D. Richards, R. Butler, H. Perlow, “Backhaul for Small Cells,” October 2012.
4. Richards, D., “40G DP-QPSK (4x10G Multiplexing) Economies,” March 2011.

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5. Richards, D., “FedEx 10GbE Unprotected Private Line Service from Colorado Springs to Memphis: A Case Study
Examining Availability, Latency and Cost Improvements,” January 10, 2011.
6. Richards, D. and J. Ng, “Mesh vs. Optimized Express Rings (4F-BLSR) Cost Analysis,” 2009-10.
7. Richards, D.,“The Business Advantage of a 40Gb/s Network: A Statistical Multiplexing Gain Based on Gaussian
Arrival Statistics,” May 2009.
8. Richards, D. and M. Lorenzo, “40G DP-QPSK & 100G Co-FDM Transmission Analysis,” December 2008.
9. Richards, D., M. Khan, S. Heagy, and M. Mohiuddin, “A Re-Route Triggering Mechanism at the DWDM Layer:
Asserting a pre-FEC BER Threshold,” (Related to IP-FRR) June 2008.
10. Richards, D., M. Di Lorenzo, B. Edinger, A. Shimamoto, D. Williams, “Forward Error Correction (FEC) and a
Practical Operating Margin: 40G PSBT,” April 2008.
11. Richards, D., “IP over DWDM (IPoDWDM) Integration: Sprint’s 40Gb/s Field Trials,” June 2007.
12. Richards, D., “Physical Layer Testing Technology Evolution Plan (TEP),” March 2006.
13. Richards, D., J. Ng, R. Watt, M. Di Lorenzo, L. Roth, J. Jankowski, B. Saunders, and C. Armstrong, “All-Optical
Bypass: Realizing ULH Transmission,” Sprint white paper, June 2005.
14. Richards, D., J. Ng, G. Wolfe, P. Caccavo, and D. Hickman “Metro-Core Optical Transport: MSTP Advancements,”
Sprint white paper, June 2005.
15. Richards, D.L., “Core Transport Technology Evolution Plan (TEP),” Sprint direction statement, 2004.
16. Richards, D.L., “Core Transport Technology Evolution Plan (TEP),” Sprint direction statement, 2003.
17. Richards, D., et al, "40Gb/s Field Trial Transmission Report," June 2004.
18. Ng, J., M.L. Jones, and D.L. Richards, “Economic Analysis of Layer 1 Restoration for Sprint Layer 2/3 Core
Networks,” Sprint white paper, September 2005.