Conference Paper

Photonic generation and transmission of UWB signals with On-Off keying and bi-phase modulation schemes

Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada
DOI: 10.1109/OECC.2009.5222414 Conference: OptoElectronics and Communications Conference, 2009. OECC 2009. 14th
Source: IEEE Xplore


On-Off keying and bi-phase modulated UWB impulse signals are optically generated and transmitted over a 20-km single mode fiber link. The transmission performance is evaluated and compared based on bit-error-rate measurement and electrical spectra analysis.

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    • "For instance, the optical spectral width of an UWB pulse generated by the spectral shaping and frequency-to-time mapping technique is in the order of several nanometers [17], [18], while the same UWB pulse produced based on phase modulation and phase-to-intensity conversion has an optical spectral width of less than 0.2 nm [19]–[21]. As a result, an UWBoF system based on the UWB pulses generated by the technique in [17], [18] can only support fiber transmission within a short distance, while that based on the technique in [19]–[21] can transmit in an optical fiber over 20 km [14]. Apparently, to have a better tolerance to fiber CD, an optical UWB signal with a narrower optical spectral width is desirable. "
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    ABSTRACT: The distribution of ultra-wideband (UWB) signals over optical fiber, or UWB over fiber (UWBoF), is proposed to extend the area of coverage and to offer the availability of undisrupted service across different networks. Various techniques have been reported recently for optical UWB pulse generation, but the study on the implementation of different modulation schemes based on these UWB pulses has just started. In addition, the influence of fiber dispersion on the power spectral density (PSD) of an UWB signal, and the bit-error-rate performance of an UWBoF system with different modulation schemes have not been systematically investigated. In this paper, we perform a comprehensive investigation of techniques to implement on-off keying (OOK), bi-phase modulation (BPM), pulse-amplitude modulation (PAM), pulse shape modulation (PSM), and pulse-position modulation (PPM) based on a phase modulator and an asymmetric Mach-Zehnder interferometer (AMZI). The AMZI is electrically reconfigurable by employing a polarization modulator (PolM). UWB signals with OOK, BPM, PAM, PSM, and PPM are realized by adjusting the polarization controllers in the AMZI and the amplitude of the electrical drive signal to the PolM. The UWB signals with OOK, BPM, PAM, and PSM are transmitted over a wired (single-mode fiber) and wireless link. Error-free operation is obtained for all the modulation schemes. The power penalties of transmission are less than 1.8 dB. The fiber dispersion on the PSD of the UWB signals is also theoretically studied and experimentally evaluated. An excellent agreement between the theoretical and the experimental results is achieved. The system is potentially integratable, which may provide a simple and cost-effective solution for UWBoF applications.
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    ABSTRACT: UWB over fiber (UWBoF) technique has been proposed to increase the area of coverage for UWB communication systems. In this paper, the transmission performance of impulse UWB signals over optical fiber is analyzed. Three types of UWB signals generated based on three different techniques are considered. Since optical signals with different optical spectra would have different tolerances to fiber dispersion, the transmission performance of the three types of UWB signals is studied. First, the impact of fiber chromatic dispersion on UWB waveforms and their spectra is evaluated. Then, the transmission performance of data-modulated UWB signals in an optical fiber is investigated, with a general model to analyze the signal power spectral density (PSD) being developed. The PSD of an UWB signal with on-off keying (OOK), bi-phase modulation (BPM) and pulse position modulation (PPM) schemes is calculated. Evolution of the PSD as a function of transmission distance is then performed. The suitability of the three types of UWB signals for UWBoF applications is also evaluated. The study provides a guideline for the design and development of a practical UWBoF system.
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