Tunable twin-guide (TTG) distributed feedback (DFB) laser with over 10 nm continuous tuning range

1993 ◽  
Vol 29 (24) ◽  
pp. 2124 ◽  
Author(s):  
T. Wolf ◽  
S. Illek ◽  
J. Rieger ◽  
B. Borchert ◽  
M.-C. Amann
Keyword(s):  
Tuning Range ◽  
Distributed Feedback ◽  
Continuous Tuning ◽  
Dfb Laser

Tunable four-wavelength DFB laser array with 10-Gbit/s speed and 5-nm continuous tuning range

1992 ◽  
Author(s):  
L. A. Wang ◽  
Y. H. Lo ◽  
M. Z. Iqbal ◽  
A. S. Gozdz ◽  
P. S. D. Lin ◽  
...  
Keyword(s):  
Tuning Range ◽  
Laser Array ◽  
Continuous Tuning ◽  
Dfb Laser

Integrated four-wavelength DFB laser array with 10 Gb/s speed and 5 nm continuous tuning range

1992 ◽  
Vol 4 (4) ◽  
pp. 318-320 ◽  
Author(s):  
L.A. Wang ◽  
Y.H. Lo ◽  
A.S. Gozdz ◽  
P.S.D. Lin ◽  
M.Z. Iqbal ◽  
...  
Keyword(s):  
Tuning Range ◽  
Laser Array ◽  
Continuous Tuning ◽  
Dfb Laser

Chirped-grating tunable DFB laser: novel laser diode with broader continuous tuning range

1993 ◽  
Author(s):  
Nong Chen ◽  
Asanobu Kitamoto ◽  
Yoshiaki Nakano ◽  
Kunio Tada
Keyword(s):  
Laser Diode ◽  
Tuning Range ◽  
Continuous Tuning ◽  
Chirped Grating ◽  
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.

Controlling the Q-Point in Distributed Feedback Lasers Using a Numerical Optimization Methodology

2019 ◽  
Vol 37 (5A) ◽  
pp. 148-156
Author(s):  
Hisham K. Hisham
Keyword(s):  
Relaxation Oscillation ◽  
Oscillation Period ◽  
Distributed Feedback ◽  
Model Parameters ◽  
Gain Compression ◽  
Sinusoidal Oscillations ◽  
Bias Level ◽  
Dfb Laser ◽  
Optimization Methodology ◽  
Gain Compression Factor

In this paper, a new methodology for controlling the Q-point in the distributed feedback (DFB) lasers is proposed. The method based on reducing the DFB transient period (TP) by optimizing laser’s model parameters numerically. The analysis has taken into account investigated the effects of the laser injection current (Iinj), the dc-bias level (Ibias), the temperature (T) variation, and the gain compression factor (ε). Results showed that by optimizing the value of Iinj, Ibias, T and ε; the Q-point could be controlled effectively. Where increasing the current ratio (i.e., Iinj/Ith) leads to reduce the TP value. In addition, by increasing Iinj and/or Ibias, the relaxation oscillation period (TRO) and the laser delay time (TDelay) are reduced significantly. From the other hand, the temperature varying may push the DFB laser to operate in an improper region through increasing the TP value; which may lead it to operate in the off-mode. Moreover, as ε is increased, the sinusoidal oscillations are dramatically damped results in a reduction in the TRO value and larger period of stabilized.

Integrated Distributed Feedback Laser and Optical Amplifier

1991 ◽  
Vol 240 ◽  
Author(s):  
N. K. Dutta ◽  
J. Lopata ◽  
R. Logan ◽  
T. Tanbun-Ek
Keyword(s):  
Active Region ◽  
Spectral Width ◽  
Optical Amplifier ◽  
Distributed Feedback ◽  
Performance Characteristics ◽  
Distributed Feedback Laser ◽  
Electrical Isolation ◽  
Current Confinement ◽  
Dfb Laser ◽  
And Performance

ABSTRACTThe fabrication and performance characteristics of an integrated distributed feedback (DFB) laser and optical amplifier structure are described. The structure utilizes semi-insulating Fe doped InP layers for current confinement to the active region, electrical isolation between the two sections and for lateral index guiding. The amplified output has a slope of 1 mW/mA of laser current with the amplifier biased at 150 mA which is a factor of 5 larger than that for a typical laser. The laser emits near 1.55 μm and the spectral width under modulation of the amplified output is considerably smaller than that for a DFB laser for the same on/off ratio.

scholarly journals Self-Aligned Emission of Distributed Feedback Lasers on Optical Fiber Sidewall

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2381
Author(s):  
Tianrui Zhai ◽  
Xiaojie Ma ◽  
Liang Han ◽  
Shuai Zhang ◽  
Kun Ge ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Coupling Effect ◽  
Wave Theory ◽  
Dip Coating ◽  
Distributed Feedback ◽  
Power Delivery ◽  
Fiber Axis ◽  
Fiber Waveguide ◽  
Multi Wavelength ◽  
Dfb Laser

This article assembles a distributed feedback (DFB) cavity on the sidewalls of the optical fiber by using very simple fabrication techniques including two-beam interference lithography and dip-coating. The DFB laser structure comprises graduated gratings on the optical fiber sidewalls which are covered with a layer of colloidal quantum dots. Directional DFB lasing is observed from the fiber facet due to the coupling effect between the grating and the optical fiber. The directional lasing from the optical fiber facet exhibits a small solid divergence angle as compared to the conventional laser. It can be attributed to the two-dimensional light confinement in the fiber waveguide. An analytical approach based on the Bragg condition and the coupled-wave theory was developed to explain the characteristics of the laser device. The intensity of the output coupled laser is tuned by the coupling coefficient, which is determined by the angle between the grating vector and the fiber axis. These results afford opportunities to integrate different DFB lasers on the same optical fiber sidewall, achieving multi-wavelength self-aligned DFB lasers for a directional emission. The proposed technique may provide an alternative to integrating DFB lasers for applications in networking, optical sensing, and power delivery.

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