Longitudinal mode selectivity above threshold for asymmetric mirror structure DFB lasers with low front facet reflectivity

1988 ◽  
Vol 24 (7) ◽  
pp. 431 ◽  
Author(s):  
H. Soda ◽  
H. Ishikawa ◽  
H. Imai
Keyword(s):  
Longitudinal Mode ◽  
Mode Selectivity ◽  
Facet Reflectivity ◽  
Front Facet ◽  
Mirror Structure

scholarly journals Spectral Linewidth vs. Front Facet Reflectivity of 780 nm DFB Diode Lasers at High Optical Output Power

2018 ◽  
Vol 8 (7) ◽  
pp. 1104 ◽  
Author(s):  
Thanh-Phuong Nguyen ◽  
Hans Wenzel ◽  
Olaf Brox ◽  
Frank Bugge ◽  
Peter Ressel ◽  
...  
Keyword(s):  
Output Power ◽  
Diode Lasers ◽  
Substantial Reduction ◽  
Distributed Feedback ◽  
Optical Output ◽  
Spectral Linewidth ◽  
Facet Reflectivity ◽  
Simulation Results ◽  
Front Facet

The influence of the front facet reflectivity on the spectral linewidth of high power DFB (distributed feedback) diode lasers emitting at 780 nm has been investigated theoretically and experimentally. Characterization of lasers at various front facet reflections showed substantial reduction of the linewidth. This behavior is in reasonable agreement with simulation results. A minimum linewidth of 8 kHz was achieved at an output power of 85 mW with the laser featuring a front facet reflectivity of 30%. The device with a front facet reflectivity of 5% reached the same linewidth value at an output power of 290 mW.

scholarly journals Investigation of Using Injection-Locked Fabry–Pérot Laser Diode With 10% Front-Facet Reflectivity for Short-Reach to Long-Reach Upstream PON Access

2013 ◽  
Vol 5 (3) ◽  
pp. 7901208-7901208 ◽  
Author(s):  
Hsing-Yu Chen ◽  
Chien-Hung Yeh ◽  
Chi-Wai Chow ◽  
Jiun-Yu Sung ◽  
Yen-Liang Liu ◽  
...  
Keyword(s):  
Laser Diode ◽  
Fabry Perot ◽  
Facet Reflectivity ◽  
Front Facet

scholarly journals Amplification and front facet reflectivity of broad area lasers

2007 ◽  
Vol 15 (19) ◽  
pp. 12344
Author(s):  
Aviv Keshet ◽  
Peter Eugster ◽  
Paul Bloudoff ◽  
Bruce G. Klappauf ◽  
Kirk W. Madison
Keyword(s):  
Broad Area ◽  
Facet Reflectivity ◽  
Broad Area Lasers ◽  
Front Facet

Lateral-mode selectivity in external-cavity diode lasers with residual facet reflectivity

1990 ◽  
Vol 26 (10) ◽  
pp. 1756-1763 ◽  
Author(s):  
W.F. Sharfin ◽  
A. Mooradian ◽  
C.M. Harding ◽  
R.G. Waters
Keyword(s):  
Diode Lasers ◽  
External Cavity ◽  
Mode Selectivity ◽  
Facet Reflectivity ◽  
Lateral Mode ◽  
External Cavity Diode Lasers

scholarly journals Nondestructive Measurement for Front Facet Temperature of Semiconductor Lasers

2021 ◽  
Vol 2112 (1) ◽  
pp. 012025
Author(s):  
Yijia Ni ◽  
Shiwei Feng ◽  
Xaozhuang Lu ◽  
Kun Bai ◽  
Yamin Zhang ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Fiber System ◽  
Nondestructive Measurement ◽  
Optical Elements ◽  
Simple Method ◽  
Semiconductor Laser Diode ◽  
All Optical ◽  
Output Facet ◽  
Facet Reflectivity ◽  
Front Facet

Abstract A convenient, simple method is proposed to measure the front facet temperature, which is the highest temperature in the semiconductor laser diode (LD), of a GaAs-based laser by employing thermoreflectance technique. Using an optical system featured in fiber connection, we measured the facet reflectivity of the 808-nm AlGaInAs/AlGaAs LD, which gives information about the temperature of the output facet. The fiber system operates at the wavelength of 1550 nm which avoids the absorption of the probe beam by the tested LD and consists of a fiber-coupled 1550 nm laser illuminant and photodiode. All optical elements in the system are connected by the fibers. The current signal collected from the photodiode is related to the facet reflectivity and represents facet temperature. We compared the facet temperatures determined by thermoreflectance technique with the cavity temperature obtained by forward-voltage method and found that the former is as much as three times as the latter.

Effect of front facet reflectivity on transmission characteristics of asymmetric reflectivity DFB lasers

1988 ◽  
Vol 24 (19) ◽  
pp. 1228 ◽  
Author(s):  
K. Kamite ◽  
H. Soda ◽  
K. Kihara ◽  
H. Nishimoto ◽  
H. Ishikawa
Keyword(s):  
Transmission Characteristics ◽  
Facet Reflectivity ◽  
Front Facet

Automatic Inspection of Pipe Using Non-Contact Guided-Wave Technique with Enhanced Mode-Selectivity

2006 ◽  
Vol 505-507 ◽  
pp. 973-978 ◽  
Author(s):  
Kyung Young Jhang ◽  
Hyun Mook Kim
Keyword(s):  
Longitudinal Mode ◽  
Target Surface ◽  
Single Mode ◽  
Guided Wave ◽  
Contact Method ◽  
Pipe Inspection ◽  
Practical Applications ◽  
Ultrasonic Guided Wave ◽  
Mode Selectivity ◽  
Wave Technique

Ultrasonic guided wave has been widely used for the pipe inspection. The conventional method is to use piezoelectric transducers that should be contacted to the target surface. However, in order to automatically inspect pipes in the manufacturing stage, non-contact inspections are strongly required. In this paper, we propose a new non-contact method for the automation of pipe inspection, which generates the ultrasonic guided wave by laser and receives by air-coupled transducer. Also we have developed a rotational canning system to show the inspection result as a 2-D image, which makes the operator find out defects easily. Then, in practical applications of guided wave techniques, it is preferred to generate and detect a single or less dispersive mode. So this paper considers the enhancement of mode-selectivity, where a laser beam illuminated through arrayed line slits is used as the transmitter and the air-coupled transducer is used as the receiver. The line arrayed laser illumination is a wavelength matching technique that can generate only a few modes. The air-coupled transducer detects the leaky wave of the propagated guided wave, and by tuning its detection angle we can detect the selected single mode. This method can generate and receive the guided wave of a specific mode, which makes the interpretation of received signal clearer and resultantly improves the accuracy of inspection. The proposed method was applied to the stainless pipe specimen with artificial defects and its inspection performance was verified. The experimental results showed that the fundamental axial-longitudinal mode was dominantly generated and received, and the location and the size of pipe defects could be displayed well in the 2 dimensional scanning images in real time.

Comparison on Injection-Locked Fabry–Perot Laser Diode With Front-Facet Reflectivity of 1% and 30% for Optical Data Transmission in WDM-PON System

2009 ◽  
Vol 27 (14) ◽  
pp. 2779-2785 ◽  
Author(s):  
Gong-Ru Lin ◽  
Hai-Lin Wang ◽  
Gong-Cheng Lin ◽  
Yin-Hsun Huang ◽  
Yi-Hung Lin ◽  
...  
Keyword(s):  
Laser Diode ◽  
Data Transmission ◽  
Optical Data ◽  
Fabry Perot ◽  
Facet Reflectivity ◽  
Front Facet ◽  
Wdm Pon
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