An Electrically Switchable Optical Ultrawideband Pulse Generator

A novel electrically switchable optical ultrawideband (UWB) pulse generator that is capable of generating both Gaussian monocycle and Gaussian doublet pulses by using a polarization modulator (PolM) and a fiber Bragg grating is proposed and experimentally demonstrated. The polarity and the shape of the generated UWB pulses can be electrically switched by adjusting the voltages applied to two arbitrary wave plates (AWPs), which are incorporated at the input and the output of the PolM to adjust the polarization state of the lightwaves. The key component in the UWB pulse generator is the PolM, which is a special phase modulator that can support both transverse electric and transverse magnetic modes but with opposite phase modulation indexes. Depending on the polarization state of the incident lightwave to the PolM that is linearly polarized and aligned to one principle axis of the PolM or circularly polarized, UWB monocycle or doublet pulses are generated. The polarity of the UWB pulses can be electrically switched by adjusting the voltages applied to the AWPs. The proposed system is implemented, and the generation of UWB monocycle and doublet pulses is experimentally demonstrated. Gaussian monocycle and doublet pulses with a fractional bandwidth of about 150% and 160% are experimentally generated. The proposed electrically switchable optical UWB pulse generator has the potential for applications in UWB communications and radar systems that employ pulse polarity modulation and pulse shape modulation schemes.

[1]  Qing Wang,et al.  UWB doublet generation using nonlinearly-biased electro-optic intensity modulator , 2006 .

[2]  T. Scullion,et al.  New uniplanar subnanosecond monocycle pulse generator and transformer for time-domain microwave applications , 2001 .

[3]  Chao Wang,et al.  All-Fiber Ultrawideband Pulse Generation Based on Spectral Shaping and Dispersion-Induced Frequency-to-Time Conversion , 2007, IEEE Photonics Technology Letters.

[4]  Walter Hirt,et al.  Composite Reconfigurable Wireless Networks: the Eu R&d Path towards 4g , 2022 .

[5]  I. Lin,et al.  Photonic synthesis of broadband microwave arbitrary waveforms applicable to ultra-wideband communication , 2005, IEEE Microwave and Wireless Components Letters.

[6]  S. Blais,et al.  Optical ultrawideband monocycle pulse generation based on cross-gain modulation in a semiconductor optical amplifier. , 2006, Optics letters.

[7]  Fei Zeng,et al.  Photonic Generation of Ultrawideband Signals , 2007, Journal of Lightwave Technology.

[8]  Debra McKeown,et al.  Ultra-wideband Radio Technology , 2004 .

[9]  Vivien Chu,et al.  Ultra Wideband Signals and Systems in Communication Engineering , 2007 .

[10]  R.J. Fontana,et al.  Recent system applications of short-pulse ultra-wideband (UWB) technology , 2004, IEEE Transactions on Microwave Theory and Techniques.

[11]  C. Nguyen,et al.  A new ultra-wideband, ultra-short monocycle pulse generator with reduced ringing , 2002 .

[12]  Hiroshi Kato,et al.  40-GHz electro-optic polarization modulator for fiber optic communications systems , 2004, Photonics North.

[13]  Fei Zeng,et al.  An approach to ultrawideband pulse generation and distribution over optical fiber , 2006 .

[14]  Ryuji Kohno,et al.  Ultra Wideband Signals and Systems in Communication Engineering: Ghavami/Ultra Wideband Signals and Systems in Communication Engineering , 2004 .

[15]  Wen-Piao Lin,et al.  Implementation of a new ultrawide-band impulse system , 2005, IEEE Photonics Technology Letters.

[16]  T. Kawanishi,et al.  Ultra-wide-band signal generation using high-speed optical frequency-shift-keying technique , 2004, 2004 IEEE International Topical Meeting on Microwave Photonics (IEEE Cat. No.04EX859).

[17]  W. Menzel,et al.  Ultra-wideband (UWB) bandpass filters using multiple-mode resonator , 2005, IEEE Microwave and Wireless Components Letters.

[18]  Fei Zeng,et al.  Ultrawideband Impulse Radio Signal Generation Using a High-Speed Electrooptic Phase Modulator and a Fiber-Bragg-Grating-Based Frequency Discriminator , 2006, IEEE Photonics Technology Letters.

[19]  G. R. Aiello,et al.  Ultra-wideband wireless systems , 2003 .

[20]  Debra McKeown,et al.  Ultra-Wideband Radio Technology: Siwiak/Ultra-Wideband , 2005 .