Simple solutions for photonic power-efficient ultra-wideband system assisted by electrical bandpass filter

doi:10.1007/s12200-012-0281-y

Front Optoelec

2012, Vol. 5

Issue (4) : 403-413 https://doi.org/10.1007/s12200-012-0281-y

RESEARCH ARTICLE

Simple solutions for photonic power-efficient ultra-wideband system assisted by electrical bandpass filter

Jianji DONG(

), Yuan YU, Bowen LUO, Dexiu HUANG, Xinliang ZHANG

Wuhan National Laboratory for Optoelectronics (WNLO), College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

We propose and experimentally demonstrate two simple solutions for power-efficient ultra-wideband (UWB) radio frequency (RF) system assisted by an electrical bandpass filter (EBPF). In the first solution, any optical Gaussian pulse with enough bandwidth is transmitted over optical fiber link, and then converted to a power-efficient UWB pulse by an EBPF with a passband of 3.1–10.6 GHz. The transmission and modulation of UWB signal is processed in optical domain, whereas the generation of UWB is processed in electrical domain. Both UWB modulations of on-off keying (OOK) and binary phase shift keying (BPSK) are experimentally demonstrated. In the second solution, the EBPF is used to convert any electrical waveform to a power-efficient UWB pulse. Then the electrical UWB pulse is converted to an optical UWB pulse with a Mach-Zehnder modulator (MZM), and then distributed over long haul fiber link. These two solutions embody the advantages of both low-loss long-haul transmission of optical fiber and mature electrical circuits. And the millimeter-wave UWB signal is also demonstrated.

Keywords ultra-wideband (UWB) microwave photonics pulse shaping

Corresponding Author(s): DONG Jianji,Email:jjdong@mail.hust.edu.cn

Issue Date: 05 December 2012

Cite this article:

Jianji DONG,Yuan YU,Bowen LUO, et al. Simple solutions for photonic power-efficient ultra-wideband system assisted by electrical bandpass filter[J]. Front Optoelec, 2012, 5(4): 403-413.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0281-y
https://academic.hep.com.cn/foe/EN/Y2012/V5/I4/403

Fig.1 First solution of power-efficient UWB configuration based on hybrid of optical fiber and electrical circuit

Fig.2 Experimental setup of power-efficient UWB generator based on hybrid of optical fiber and RF circuit

Fig.3 (a)-(c) are input RZ pulse, EBPF output waveform, and EBPF output spectrum, respectively when the pulsewidth of Gaussian pulse is 5 ps; (d)-(f) are input Gaussian pulse, EBPF output waveform, and EBPF output spectrum, respectively when the pulsewidth of Gaussian pulse is 50 ps

Fig.4 Power efficiency of generated UWB waveform as function of pulsewidth of input Gaussian pulse

Fig.5 Duration of UWB signal as function of EBPF bandwidth

Fig.6 Frequency response of two EBPF samples

Fig.7 (a) and (b) are measured UWB waveform and electrical spectrum with 25 ps RZ pulse injection; (c) and (d) are measured UWB waveform and electrical spectrum with 50 ps RZ pulse injection

Fig.8 (a) and (b) are measured PAM of UWB signals and its electrical spectrum with 50 ps RZ pulse injection

Fig.9 (a) and (b) are measured UWB waveform and electrical spectrum with 25 ps RZ pulse injection; (c) and (d) are measured UWB waveform and electrical spectrum with 50 ps RZ pulse injection. An EBPF of 8-10 GHz is used

Fig.10 Experimental setup for BPSK modulation of UWB signals

Fig.11 (a)–(d) are generated temporal waveforms of 4-bit Walsh-Hadamard codes; (e)–(h) are electrical spectra, respectively

Fig.12 Second solution of power-efficient UWB generation and transmission

Fig.13 (a)-(b) are pair of measured bi-polar UWB waveforms with 50 ps Gaussian pulse injection; (c)-(d) are pair of measured bi-polar UWB waveforms with 25 ps Gaussian pulse injection; (e)-(h) are corresponding electrical spectra, respectively

Fig.14 (a) and (b) are pair of polarity-reversed UWB waveforms after transmission by 10 km SMF; (c) and (d) are corresponding electrical spectra

Fig.15 Frequency responses of UWB antenna pair in their peak radiation direction in azimuth plane with distance of 1, 5, 10, and 20 cm, respectively

Fig.16 Measured waveform (a) and RF spectrum (b) after antenna transmission

Fig.17 (a) and (c) are pair of polarity-reversed millimeter wave UWB signals; (b) and (d) are correspondingly measured RF spectra

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