Design for single-mode asymmetric quarter-wavelength-shifted DFB laser with high differential efficiency

1987 ◽  
Vol 23 (11) ◽  
pp. 598-599 ◽  
Author(s):  
H. Soda ◽  
H. Ishikawa ◽  
H. Imai
Keyword(s):  
Single Mode ◽  
Quarter Wavelength ◽  
Dfb Laser ◽  
Differential Efficiency

Gigabit/s performance of quarter-wavelength shifted DFB laser

1988 ◽  
Vol 24 (8) ◽  
pp. 495 ◽  
Author(s):  
H. Ishikawa ◽  
K. Kamite ◽  
K. Kihara ◽  
H. Soda ◽  
H. Imai
Keyword(s):  
Quarter Wavelength ◽  
Dfb Laser

DFB Lasers with Tilted Waveguide for Multi-Wavelength Generation

2007 ◽  
Vol 31 ◽  
pp. 36-38 ◽  
Author(s):  
Lip Fah Chong ◽  
Jing Hua Teng ◽  
Ee Leong Lim ◽  
Norman Soo Seng Ang ◽  
J.R. Dong ◽  
...  
Keyword(s):  
Single Mode ◽  
Distributed Feedback ◽  
Couple Mode ◽  
Threshold Condition ◽  
Couple Mode Theory ◽  
Gain Margin ◽  
Ridge Waveguides ◽  
Multi Wavelength ◽  
Dfb Laser ◽  
Lasing Frequency

In this paper, we present the theoretical investigation of index-coupled distributed feedback (DFB) laser with tilted single mode ridge waveguides. By tilting part of the ridge waveguide in various degrees, DFB laser with manifold effective grating periods can be realized. The structure is analyzed using couple mode theory in matrix form based on threshold analysis. Important parameters of DFB laser like resonant frequency and threshold gains are obtained by solving the eigen-equation. The results indicate not only that the lasing frequency is modulated by the waveguide titling angle, but also large Gain Margin (GM) can be achieved at the threshold condition which enhance the stable single mode operation in index-coupled DFB laser.

scholarly journals Closed-loop ring resonator topology for bandpass filter applications

2020 ◽  
Vol 17 (3) ◽  
pp. 1422
Author(s):  
Norfishah Ab Wahab ◽  
M. N. Md Tan ◽  
M. N. Hushim
Keyword(s):  
Transmission Lines ◽  
Closed Loop ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Single Mode ◽  
Ring Structure ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Loop Ring

<p class="Pa41">This paper presents a single mode pseudo-elliptic bandpass resonator based on closed-loop ring topology. The resonator is built from six quarter wavelength transmission lines to form a square closed-loop ring structure. This structure creates transmission zeros at the lower and upper sidebands so that high selectivity bandpass filter response is achieved. The advantage of this topology is that the design is less complex since no perturbation is needed on the ring lines for creation of transmission zeros. Higher-order filters can be constructed by introducing quarter-wavelength coupled-lines, coupled at both input and output of the closed-loop ring resonator. For proof of concept, the filters are designed at 10 GHz up to 3<sup>rd</sup> order, simulated using full-wave electromagnetic simulator on microstrip substrate, <em>FR-4</em> with characteristics given as <em>Ԑr </em>= 4.70, <em>h </em>= 1.499 mm and <em>tan δ </em>= 0.012.  The filters are simulated and responses are found to be agreeable with the proposed idea.</p>

scholarly journals Bistable 1060-nm High-Power Single-Mode DFB Laser Diode

2015 ◽  
Vol 7 (5) ◽  
pp. 1-7 ◽  
Author(s):  
Shaoyang Tan ◽  
Mengdie Sun ◽  
Dan Lu ◽  
Ruikang Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Laser Diode ◽  
High Power ◽  
Single Mode ◽  
Dfb Laser

280 Mbit/s single-mode fibre transmission with DFB laser diode emitting at 1.53 μm

1982 ◽  
Vol 18 (5) ◽  
pp. 239 ◽  
Author(s):  
S. Yamamoto ◽  
K. Utaka ◽  
S. Akiba ◽  
K. Sakai ◽  
Y. Matsushima ◽  
...  
Keyword(s):  
Laser Diode ◽  
Single Mode ◽  
Single Mode Fibre ◽  
Fibre Transmission ◽  
Dfb Laser ◽  
Mode Fibre
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