Radio over fiber network

DESIGN AND SIMULATION OF DWDM BASED RADIO OVER FIBER WIRELESS NETWORKSPresented by: Affan Hasan Khan (07-TE-36) Omer Khalid (07-TE-68) Project Supervisor Prof. Dr. M Khawar Islam

Centralized headend Simplified RAUs Smaller cell size

Increased carrier Frequency Low cost equipment

[1] Anthony Ngoma,Radio-over-Fibre Technology for Broadband Wireless Communication Systems 2005 [2] D.Opati, Radio over Fiber Technology for Wireless Access [3] Mohammad Shaifur Rahman, Jung Hyun Lee, Youngil Park, and Ki-Doo Kim Radio over Fiber as a Cost Effective Technology for Transmission of WiMAX Signals World Academy of Science, Engineering and Technology 56 2009 [4] A Radio over Fiber Network Architecture for Road Vehicle Communication Systems

UWB radio technology

UWB and RoF W-PAN applications Spectrum unavailability

FCC authorization

UWB pulses

[1] F. Zeng, Q. Wang and J. Yao, All-optical UWB impulse generation based on cross-phase modulation and frequency discrimination, ELECTRONICS LETTERS, 18th January 2007, Vol. 43 No. 2 [2] Wang, Q., Zeng, F., Blais, S., and Yao, J., Optical ultrawideband monocycle pulse generation based on cross-gain modulation in a semiconductor optical amplifier, Opt. Lett., 2006, 31, pp. 30833085 [3] Q. Wang and J. Yao, "UWB doublet generation using nonlinearly-biased electro-optic intensity modulator," Electron. Lett. 42, (2006), 1304--1305 [4] J. Q. Li, S. N. Fu, K. Xu, J. Wu, J. T. Lin, M. Tang, and P. Shum, "Photonic ultrawideband monocycle pulse generation using a single electro-optic modulator," Opt. Lett., vol. 33, no. 3, pp. 288-290, Feb. 2008Opt. Lett. 33, 288 (2008).

Design and simulate an RoF system to support UWB radio RoF for range extension and RAU simplification

On-Off Keying Pulse Position Modulation Pulse Amplitude Modulation

UWB generation mechanism On Off Keying Differentiation of Gaussian pulses

Efficient spectrum usage

100 Ghz frequency spacing 32 different locations

UWB monocycle at 2 Gbps

UWB Monocycle spectrum at 2 Gbps

32 DWDM channels

Received signal after travelling 1 km fiber span with 0.2 db/km attenuation & 16.75 ps/nm/km dispersion

Need for medium sharing

Code Division Multiple Access Entire spectrum available to all users

Receiv er

Low power operation of UWB

Self Phase Modulation (SPM) Four Wave Mixing (FWM)

Pulse phase modulated by its own intensityOptical Fiber Length (Km) Transmitted Power (dBm) Output Power (dBm) -41.3 -41.3 -41.3 -41.3 -41.3 -41.3 -41.3 -41.3 -41.3 -41.3 Self Phase Modulation 1 5 10 20 25 30 40 50 75 100 3 4.6 6.6 10.6 12.6 14.6 18.6 22.6 32.6 42.6 Controllable by dispersion Controllable by dispersion Controllable by dispersion Controllable by dispersion Controllable by dispersion Controllable by dispersion Dominant Dominant Dominant Dominant

1250 100 150

Amplifier placement to operate under 18.6 dBm Need an amplifier after every 100 KmPump Power (mW) 7.25 15 200 Output Power (dBm) -41.3 -41.3 -41.3 Remarks Amplified Amplified Amplified but with excessive noise and very high amplifier specs

Optical Fiber Length (Km)

Dispersion Compensation Must be provided every 50 Km

1 Km Dispersion Compensation Fiber (DCF)

11 5 10 20 20

Four Wave MixingTransmitted Power (dBm)3 4.6 6.6 10.6 10.6

Optical Fiber Length (Km)

Output Power (dBm) -41.3-41.3 -41.3 -41.3 -41.3

Dispersion ps/nm/Km16.75 16.75 16.75 16.75 30

Four Wave MixingAbsent Absent Absent Present Controlled

More Dispersion Compensation will be required

RoF system to support UWB radio

DWDM and hybrid RoF systems Multiple Access scheme Optical Amplifiers and nonlinearities System optimization

1. Affan Hasan Khan, Omer Khalid, Ateeq Mumtaz, M.K.Islam, DWDM Based System for Optical Generation and Transmission of Impulse Radio UWB Signals, 7th International Conference on Emerging Technologies, 2011.

We designed a complete and economical optical fiber backbone network to support very high data rate UltraWideband Radio. A simple technique for optical generation of Impulse radio UWB pulses is introduced along with the mechanism to transmit the data of 32 different sites over a single optical fiber using Dense Wavelength Division Multiplexing. To differentiate users over the common wireless medium, Code Division Multiple Access technique is employed in the system. A comparison of different optical amplifiers is conducted and the effects of index based nonlinearities is observed.

Thank you