Wavelength Division Multiplexing/Optical Code Divison Multiplexing System Based on Supercontinuum and Supersturctured Fiber Bragg Grating

Xiaogang, 陈小刚 Chen; Dexiu, 黄德修 Huang; Xiuhua, 元秀华 Yuan; Ge, 夏舸 Xia

doi:10.3788/cjl20083501.0077

Cited by 6 publications

(1 citation statement)

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“…Such a characteristic profile proves that the excitation of the Kr (6d 2 [3/2] 2 ) state is due to the laser-induced interatomic transition of Xe (4f 2 [9/2] 4 ) → Kr (6d 2 [3/2] 2 ). While the dipole-dipole LICET spectra [11,[16][17][18]22] are characterized by the full width at half maximum peak of the profile being less than 10 cm −1 , the quadrupole-quadrupole LICET presented here has a much wider profile (∼30 cm −1 ).…”

Section: Resultsmentioning

confidence: 76%

Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr systems

Chen

Fan

et al. 2012

Phys. Rev. A

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Experimental investigation of laser-induced quadrupole-quadrupole collisional energy transfer between Xe and Kr is reported in this paper. The excitation spectrum of laser-induced collisional energy transfer (LICET) is characterized by a slowly decreasing tail on the blue side of the peak and a width of ∼30 cm −1 . The experimental evidence shows that in the quasistatic wing the quadrupole-quadrupole LICET spectrum follows a power law that is different from the dipole-dipole LICET line shape and the profile of the quadrupole-quadrupole LICET decreases more slowly than the dipole-dipole LICET profile. The results indicate that the laser-induced quadrupole-quadrupole collision can be considered as a practical process to transfer energy selectively from a storage state making a parity-nonallowed transition to a target state making a parity-allowed transition.

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Section: Resultsmentioning

confidence: 76%

Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr systems

Chen

Fan

et al. 2012

Phys. Rev. A

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Calculation of laser induced collisional energy transfer in the Sr-Ca system

Chen

Fan

et al. 2010

Sci. China Phys. Mech. Astron.

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Based on the four-state model of laser-induced collisional energy transfer, the cross section of the collisional energy transfer in the Sr-Ca system is obtained. Various factors, including field intensity, relative speed, and temperature, which influence the collisional cross section, are discussed for illustrating the features of the Sr-Ca laser-induced collisional energy transfer (LICET) process. The calculated results show that the LICET spectral profiles obviously become narrower when the laser field intensity increases. The collision cross section rises with laser intensity and tends to saturate. In the vicinity of the spectral profile center, the cross section at fixed laser detuning becomes smaller as the relative speed and system temperature increase. The results indicate that the intermediate states strongly affect the spectral profile of LICET.laser-induced collisional energy transfer, collision cross section, Sr-Ca system PACS: 34.50.Rk, 32.70.Jz

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Dual wavelength filtering properties and applications of the π-phase-shifted sampled fiber Bragg gratings

Jiang

Zhang

Tian

2011

Optoelectron. Lett.

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Multi-ð-phase-shifted fiber Bragg gratings and ð-phase-shifted sampled fiber Bragg gratings (SFBGs) with dual wavelength filtering properties are compared. Results show that both of these gratings have the dual wavelength reflective spectra. However, the side lobe of the reflective spectrum of ð-phase-shifted SFBGs is lower than that of multi-ð-phaseshifted gratings. By adjusting the duty cycle in the range of 0.66 0.80, the filtering properties of ð-phase-shifted SFBGs are optimized, and the side lobe suppression ratio (SLSR) is the lowest when the duty cycle is 0.75. The application of the ð-phase-shifted SFBGs in the dual-wavelength laser is also demonstrated.Optical phase-shifted fiber Bragg gratings and sampled fiber Bragg gratings (SFBGs) have wide applications in optical communication systems. The phase-shifted fiber Bragg gratings have strong applications in single wavelength fiber lasers [1] and optical demodulation systems [2] due to the narrow transmission window at the reflective peak [3,4] . The sampled fiber Bragg gratings have important applications as comb filters in multi-wavelength lasers and optical wavelength division multiplexing systems due to the multiple reflective peaks [5][6][7][8][9][10] . Recently the dual wavelength filter has been designed with different kinds of fiber gratings, such as phase-shifted gratings [11] and SFBGs [12] . The dual wavelength spectrum can be obtained by phase-shifted gratings. However, the amplitudes of the side peaks in reflective spectra are relatively high. So how to reduce amplitude of side peak is a key issue to study. The dual wavelength filter has been proposed by SFBGs with a special sampled structure [12][13][14] . The side peak in the reflective spectrum of the SFBGs is improved compared with that of phase shifted gratings. And the gratings have been applied successfully in dual wavelength fiber lasers [15,16] .In this paper, we analyze the requirement to obtain the dual wavelength filter with sampled fiber gratings, and find that the ð phase shift and the periodic structure are two important conditions. In order to obtain the dual wavelength filtering with low side lobe, we optimize the structure parameters of SFBGs and find that the ð phase shifted SFBG with duty cycle in the range of 0.66 0.80 has better dual wavelength properties. The lowest side peak is obtained when the duty cycle is 0.75. A dual-wavelength fiber laser based on a pair of SFBGs (SFBGp) is also demonstrated.The multi-ð-phase-shifted gratings and -phase-shifted SFBGs ( the non-sampled section must be equivalent to ð phase shift, where 4 L/n=(2m+1) , m=1, 2, 3 , and L is the length of the non-sampled section) can realize dual wavelength filtering. The two kinds of gratings both have periodic structure and the equivalent shifted phases are both ð. In a ð phase-shifted grating, inserting a ð phase shift between two grating sections can split one reflective peak into two peaks with the same amplitude. The reflective spectrum can be interpretted as two beam interference. When multiple...

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Wavelength Division Multiplexing/Optical Code Divison Multiplexing System Based on Supercontinuum and Supersturctured Fiber Bragg Grating

Cited by 6 publications

References 0 publications

Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr systems

Laser-induced quadrupole-quadrupole collisional energy transfer in Xe-Kr systems

Calculation of laser induced collisional energy transfer in the Sr-Ca system

Dual wavelength filtering properties and applications of the π-phase-shifted sampled fiber Bragg gratings

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