WOWS

 

Wavelength multiplexed bilateral linearised
Optically fed Wireless Systems (WOWS)

T. Ismail, C.P. Liu and A.J. Seeds

Partners

University of Cambridge

Funding

Agilent,EPSRC

 

Introduction

The project seeks to meet the challenges of providing broadband optically fed millimetre-wave wireless (including cellular) systems at low cost by investigating architectures which use modulation linearisation, wavelength division multiplexing (WDM) and bilateral optical amplification to provide multi-operator uplinks and downlinks to a number of antenna sites using a single fibre feed.

 

Objectives

The work aims to design, construct and assess a full duplex demonstrator operating in the frequency range 26 to 33 GHz for data rates up to 155 Mbit/s per channel, capable of addressing multiple  antenna sites (~10) using single-mode fibre.

Specific areas where our Laboratory is active include,

a) further development of the OIPLL previously implemented in our labs, for remote optical delivery of millimetre-wave reference signals,

b) linearisation of optical components by using microwave broadband Feed-Forward technique, and

c) system architecture including network capacity and impairment modelling, optimisation of system architecture demonstrator design, evaluation of requirements for WDM and evaluation of system demonstrator performance.

 

Related Publications

[1]   A. J. Seeds, “Towards Terahertz Photonics,” Microwave Photonics, International Topical Meeting on Microwave Photonics 2002, pp. 17-20, Awaji, Japan, November 2002.

 

[2]   A. J. Seeds, “Wireless Access Over Optical Fibre: From Cellular Radio To Broadband; from UHF to Millimetre-Waves,” The 15th Annual Meeting of the Lasers and Electro-Optics Society, 2002. LEOS 2002, vol. 2, pp. 471-472, 2002.

 

[3]   A. J. Seeds, “Microwave Photonics,” IEEE Transactions on Microwave Theory and Techniques, vol. 50, issue 3 , pp. 877-887, Mar. 2002

 

[4]   A. J. Seeds, “Photonic Techniques For Microwave Frequency Synthesis,” The 13th Annual Meeting of the Lasers and Electro-Optics Society, 2000. LEOS 2000, vol. 1, pp. 72-73, 2000.

 

[5]   L. A. Johansson and A. J. Seeds, “Generation and Transmission Of Millimeter-Wave Data-Modulated Optical Signals Using an Optical Injection Phase-Lock Loop,” Journal of Lightwave Technology, vol. 21, issue. 2, pp. 511-520, Feb. 2003.

 

[6]   L. A. Johansson, C. P. Liu and A. J. Seeds, "A 65-km Span Unamplified Transmission of 36-GHz Radio-Over-Fiber Signals Using an Optical Injection Phase-Lock Loop, " IEEE Photonics Technology Letters, vol. 14, no. 11, pp. 1596-1598, Nov 2002.

 

[7]   L. A. Johansson, D. Wake and A. J. Seeds, "Millimetre-Wave Over Fibre Transmission Using A BPSK Reference-Modulated Optical Injection Phase-Lock Loop, " Optical Fiber Communication Conference and Exhibit, Anaheim Convention Center, Anaheim, California, USA, WV3, March 17-22, 2001.

 

[8]   L. A. Johansson, A. J. Seeds, "Millimeter-Wave Modulated Optical Signal Generation With High Spectral Purity And Wide-Locking Bandwidth Using A Fiber-Integrated Optical Injection Phase-Lock Loop," IEEE Photonics Technology Letters , Volume: 12, Issue: 6, pp. 690 –692, June 2000.

 

[9]   T. Ismail and A. J. Seeds, “Laser diode nonlinearity compensation using feed-forward linearization in a fiber radio system,” Postgraduate Research Conference in Electronics, Photonics, Communications & Networks, and Computing Science (PREP2004), 5-7 April 2004, University of Hertfordshire, UK

 

[10]  T. Ismail and A. J. Seeds, “Feed-forward linearisation of directly modulated laser for radio over fibre wireless LAN, “ Second NEFERTITI Winter School in Microwave Photonics, York, February 2004.

 

[11]  T. Ismail, C. P. Liu and A. J. Seeds, “Uncooled directly modulated high dynamic range source for IEEE802.11a wireless over fibre LAN applications,” Optical Fiber Communications 2004 (OFC 2004), February 22-27, 2004, Los Angeles Convention Center, Los Angeles, California, USA.

 

[12]  T. Ismail and A. J. Seeds, “Nonlinear distortion reduction in directly modulated semiconductor laser using feed-forward linearization,” Proceedings of the London Communications Symposium 2003 (LCS 2003), pp. 325-328, September 2003.

 

[13]  Cai, B.; Johansson, L.A.; Silva, C.F.C.; Bennett, S.; Seeds, A.J.;
”Crosstalk, noise, and stability analysis of DWDM channels generated by injection locking techniques”, Lightwave Technology, Journal of  ,Volume: 21 , Issue: 12 , Dec. 2003, pp. 3029 – 3036

 

[14]  Johansson, L.A.; Seeds, A.J.; ”36-GHz 140-Mb/s radio-over-fiber transmission using an optical injection phase-lock loop source” Photonics Technology Letters, IEEE  ,Volume: 13 , Issue: 8 , Aug. 2001, pp. 893 – 895

 

[15]  Johansson, L.A.; Seeds, A.J.; “Optical delivery of modulated millimetre-wave signals using free-running laser heterodyne with frequency drift cancellation”, Microwave Symposium Digest, 2002 IEEE MTT-S International  ,Volume: 3 , 2-7 June 2002, pp. 1695 – 1697

 

[16]  Johansson, L.A.; Seeds, A.J.; “Multi-octave photonic RF synthesiser based on two DFB lasers Microwave Photonics”, 2001. MWP '01. 2001 International Topical Meeting on , 7-9 Jan. 2002
pp. 97 – 99

 

[17]  Johansson, L.A.; Wang, X.; Gomes, N.J.; Seeds, A.J.; “Optical delivery of millimetre-wave carriers using double injection locking”,
Microwave Photonics, 2001. MWP '01. 2001 International Topical Meeting on , 7-9 Jan. 2002, pp. 89 – 92

 

[18]  Johansson, L.A.; Seeds, A.; “Multi-octave photonic RF synthesiser based on two DFB lasers”, Electronics Letters  ,Volume: 38 , Issue: 12 , 6 June 2002, pp. 563 - 564