Fast wavelength switching and simultaneous FSK modulation using tunable DBR laser

1990 ◽  
Vol 26 (5) ◽  
pp. 308 ◽  
Author(s):  
H. Kobrinski ◽  
M.P. Vecchi ◽  
T.E. Chapuran ◽  
J.B. Georges ◽  
C.E. Zah ◽  
...  
Keyword(s):  
Wavelength Switching

Chemical Fingerprint Analysis and Simultaneous Determination of Nucleosides and Amino Acids in Kang Fu Xin Liquid by High Performance Liquid Chromatography with Diode Array Detector

2020 ◽  
Vol 16 (7) ◽  
pp. 831-843
Author(s):  
Yuwen Wang ◽  
Shuping Li ◽  
Liuhong Zhang ◽  
Shenglan Qi ◽  
Huida Guan ◽  
...  
Keyword(s):  
Amino Acids ◽  
Quality Control ◽  
Uric Acid ◽  
Control Method ◽  
Principal Component ◽  
Gradient Elution ◽  
Hplc Method ◽  
Array Detector ◽  
Fingerprint Analysis ◽  
Wavelength Switching

Background and Objective: Kang Fu Xin liquid (KFX) is an official preparation made from the ethanol extract product from P. Americana. The present quality control method cannot control the quality of the preparation well. The aim of the present study is to establish a convenient HPLC method for multicomponents determination combined with fingerprint analysis for quality control of KFX. Methods: An HPLC-DAD method with gradient elution and detective wavelength switching program was developed to establish HPLC fingerprints of KFX, and 38 batches of KFX were compared and evaluated by similarity analysis (SA), hierarchical clustering analysis (HCA), and principal component analysis (PCA). Meanwhile, six nucleosides and three amino acids, including uracil, hypoxanthine, uric acid, adenosine, xanthine, inosine, tyrosine, phenylalanine and tryptophan in KFX were determined based on the HPLC fingerprints. Results: An HPLC method assisted with gradient elution and wavelength switching program was established and validated for multicomponents determination combined with fingerprint analysis of KFX. The results demonstrated that the similarity values of the KFX samples were more than 0.845. PCA indicated that peaks 4 (hypoxanthine), 7 (xanthine), 9 (tyrosine), 11, 13 and 17 might be the characteristic contributed components. The nine constituents in KFX, uracil, hypoxanthine, uric acid, adenosine, xanthine, inosine, tyrosine, phenylalanine and tryptophan, showed good regression (R2 > 0.9997) within test ranges and the recoveries of the method for all analytes were in the range from 96.74 to 104.24%. The limits of detections and quantifications for nine constituents in DAD were less than 0.22 and 0.43 μg•mL-1, respectively. Conclusion: The qualitative analysis of chemical fingerprints and the quantitative analysis of multiple indicators provide a powerful and rational way to control the KFX quality for pharmaceutical companies.

Wavelength switching in InGaAs/InP quantum well lasers

1990 ◽  
Vol 56 (2) ◽  
pp. 122-124 ◽  
Author(s):  
K. Berthold ◽  
A. F. J. Levi ◽  
T. Tanbun‐Ek ◽  
R. A. Logan
Keyword(s):  
Quantum Well ◽  
Quantum Well Lasers ◽  
Wavelength Switching

Thermal drift in wavelength-switching DFB and DBR lasers

1997 ◽  
Vol 33 (9) ◽  
pp. 780 ◽  
Author(s):  
A.A. Saavedra ◽  
R. Passy ◽  
J.P. von der Weid
Keyword(s):  
Thermal Drift ◽  
Wavelength Switching ◽  
Dbr Lasers

Wavelength switching by mode interference of coupled cavities with photonic crystal reflectors

2003 ◽  
Vol 77 (8) ◽  
pp. 733-737 ◽  
Author(s):  
S. Mahnkopf ◽  
M. Kamp ◽  
R. März ◽  
G.-H. Duan ◽  
V. Colson ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Wavelength Switching ◽  
Coupled Cavities ◽  
Mode Interference
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