6-channel photonic generation of ultra-wideband signals using multiple nonlinear characteristics in a parallel FOPA structure

doi:10.1007/s12200-011-0189-y

Front Optoelec Chin

2011, Vol. 4

Issue (4) : 448-453 https://doi.org/10.1007/s12200-011-0189-y

REVIEW ARTICLE

6-channel photonic generation of ultra-wideband signals using multiple nonlinear characteristics in a parallel FOPA structure

Liang ZHAO¹(

), Junqiang SUN²

1. Wuhan Foreign Languages School, Wuhan 430022, China; 2. Wuhan National Laboratory for Optoelectronics, College of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

We propose an approach to generating 6-channel polarity-inverted ultra-wideband (UWB) doublets by utilizing the parallel fiber-optical parametric amplifier (FOPA) configuration. The pulse-splitting effect in a highly nonlinear fiber (HNLF) is exploited to generate the double-overshoot and the double-undershoot, which are the basic components required to form a UWB pulse. Under the circumstances of different relative time advance/delays (RTADs) and different initial Gaussian pulse durations, the key parameters, including center frequency (Fc), 10-dB bandwidth (BW_10dB) and fractional bandwidth (FBW) for a UWB doublet are systematically investigated, eventually proved in line with the U. S. Federal Communications Commission (FCC) regulation.

Keywords ultra-wideband (UWB) pulse-splitting fiber-optical-parametric-amplifier (FOPA) highly nonlinear fiber (HNLF)

Corresponding Author(s): ZHAO Liang,Email:liangshao_acool@smail.hust.edu.cn

Issue Date: 05 December 2011

Cite this article:

Liang ZHAO,Junqiang SUN. 6-channel photonic generation of ultra-wideband signals using multiple nonlinear characteristics in a parallel FOPA structure[J]. Front Optoelec Chin, 2011, 4(4): 448-453.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-011-0189-y
https://academic.hep.com.cn/foe/EN/Y2011/V4/I4/448

Fig.1 (a) Parallel FOPA configuration; (b) schematic diagram of polarity-inverted UWB doublets generation process. PCs: polarization controllers; OCs(1-4): 1/1 optical couplers; OCs(5,6): 1/4 optical couplers; PM: phase modulator; PD: photodetector

Fig.2 Temporal waveforms for (a) signal; (b) pump; (c) idler; (d) satellite waves with fiber lengths of 250 and 450 m, respectively

Fig.3 Temporal and spectral intensity for positive and negative UWB doublet for different channels with different RTADs

Fig.4 Temporal profiles ((a), (b), and (c)) and corresponding spectral intensities (d) for the UWB doublet with different initial signal pulse durations

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