Stable pulses at the repetition of 6.25 MHz with 691.2 fs pulse width were generated. The spectrum bandwidth of the fiber laser at center wavelength of 1 561.5 nm was about 21.7 nm.
The experimental results demonstrate that the center wavelength is linear with the temperature change, It also shows that wavelength tuning range of the FBG sample is up to 1.5nm and the accuracy is better than 0.05nm and has little influence with the change of environmental temperature.
The measured center wavelength is 1550. 85 nm, wavelength channel spacing is about 0. 81nm, 3-dB bandwidth is about 0. 35 nm. The crosstalk is about - 20dB, and the insertion loss is between 10. 4dB for the central port and 11. 9dB for the edge ports.
Based on the transmission theory of the arrayed waveguide grating(AWG),the parameter optimization was performed,and the effect of arrayed waveguides bending on transmission characteristics was analyzed for a 33×33 polymeric AWG multiplexer around the central wavelength of 1550.918 nm with the wavelength spacing of 0.8 nm.
When the central wavelength of the following filter is blue shifted by 0.25 nm or red shifted by 0.05 nm with respect to the wavelength of probe signal,the WC is inverted.
Supercontinuum emission with a smooth spectrum stretching from 450 to 1 400 nm is obtained by injecting 30 fs Ti: sapphire laser pulses with an energy of up to 5 nJ,a pulse repetition rate of 100 MHz and a central wavelength of 800 nm into 2 meters of such a photonic crystal fiber.
Using a triple-layer antireflection coating on facets of InGaAsP semiconductor laser chips, the minimum facet reflectivity <10~-4 at the center-wavelength of 1 310 nm and the semiconductor optical amplifiers with ASE ripple <0.5 dB are obtained.
A design example is given for the center-wavelength of 850nm by choosing TiO2 and SiO2,and the result shows that effective refractive index must be considered while designing in order to achieve good performance.
In this paper,it is introduced that a kind of omnidirectional reflector in special spectrum band can be designed by λ/4 film system. Formulas of the center-wavelength and the edge-wavelength of the reflection band are given. It is also analysed quantitativly that how the Brewster angle can be avoided in multiplayer designs.
A six layer planar waveguide model has been proposed to analyse the ion beam etched fiber grating filter After optimizing the parameters,in our experiment,we have obtained a narrow band high reflectivity Bragg fiber filter with 1530 6nm centre wavelength,99% reflectivity and 0 3nm bandwidth
For a center wavelength of FBG of about 1550 nm and a 40 nm shift range of its reflection wavelength, the relative error of measurement is only ± 0.001.
The wavelength of the light source is modulated at a frequency of 10?kHz, and the center wavelength is stabilized at the center of the 2ν3 band R(3) line of methane (1.65372?μm).
Variations in the intensity of the solar radiation are measured in the six spectral intervals of the multi-channel photometer: 350, 500, 650, 850, 1100, and 1500 nm, with the bandwidths being about 10% of the central wavelength of each interval.
The RATAN-600 Zenith Field (RZF) catalog was obtained at the central wavelength of 7.6 cm, and contains 437 radio sources, virtually all of which have been identified with NVSS objects.
This effect reduces unwanted variations in the central wavelength, as well as fluctuations of the delay time of the frequency-shifted soliton with respect to the input pulse.
By slightly tuning the central wavelength of the narrowband FBG, SLM lasing at 1549.658 or 1549.563 nm (corresponding to the two transmission peaks of the FBG-FPF) is achieved with a laser output power of ～4 mW, when the pump power is ～75 mW.
The repetition rate of the laser oscillator is 173 MHz at the centre wavelength of 791 nm, and the ultrabroaden spectrum covers from 600 nm to 1000 nm.
At the optimum length of 7?m (αeffL=2.9, where αeff is the effective absorption coefficient of the fibre and L is the fibre length), the fibre laser output was measured to have a centre wavelength of 2105?nm and a line width of ～20?nm.
Theoretical calculations show that, by inserting an intermediate dielectric layer with suitable thickness and shape between the fibres, the centre wavelength can be shifted easily over a range of ±30 nm.
中心波长
center wavelength 
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