or color in a given spectral range As such these quantum devices have found numerous applications in many diverse fields In particular tunable lasers have played a crucial and sustained role in advancements of fundamental physics and science ID: 675484
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Slide1Slide2
INTRODUCTION
Tunable lasers are different to traditional lasers because they can continuously change their emission wavelength,
or
color, in a given spectral range
.
As such,
these
quantum devices have found numerous applications in many diverse fields
.
In particular, tunable lasers have played a crucial and sustained role in advancements of fundamental physics and science
.
A
Tunable laser
is a
laser
whose
wavelength
of operation can be altered in a controlled manner.
While all
laser gain media
allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range. Slide3
DEFINITION
Tunable
lasers
as the name suggests are lasers whose wavelengths can be tuned or varied.
They
play an important part in optical communication
networks
Recent improvements in tunable laser technologies are enabling highly flexible and effective utilization of the massive increases in optical network capacity brought by large-scale application of dense wavelength division multiplexing.
The
distributed feedback laser (DFB), the external cavity diode laser, the vertical cavity diode laser and the micro electro mechanical system (MEMS)
technology
Tunable lasers are still a relatively young technology, but as the number of wavelengths in networks increases so will their importance.Slide4
A tunable laser is a
laser
whose
wavelength
of operation can be altered in a controlled manner.
Tunable lasers are now widely used as light sources in DWDM systems. the tunable lasers are used both as a light source in the transmitter and as a local oscillator in the receiver. We can use this tunable lasers are enabling highly flexible and effective utilization of the massive increases in optical network capacity brought by large-scale application of dense wavelength division multiplexing Tunable lasers are still a relatively young technology,
ADVANTAGES OF TUNABLE
LASERSlide5
APPLICATIONS
1.
spectroscopy
2.
photochemistry3.atomic vapor laser isotope separation,
4.
optical
communications
5.Spectroscopic Applications of Pulsed Tunable Optical Parametric
Oscillators
.
6.Solid-State Dye
Lasers
7.Tunable Lasers Based on Dye-Doped Polymer Gain Media Incorporating 8.Homogeneous Distributions of Functional
NanoparticlesSlide6
CONCLUSIONS
For the 100-Gbit/s system now being developed as a next-generation optical communication system
,
we have160 kHz was demonstrated using a TLA with 1500-μm-long DFB
lasers
. In addition to the line width characteristics described here, the tunable laser requires higher power, a wider tuning range, and lower power consumption.
Research and development will continue with the aim of obtaining tunable lasers with even better performance
Slide7
REFERENCES
[1] H. Ishii et al.,
Quasicontinuous
wavelength tuning in superstructure- grating (SSG) DBR lasers
, IEEE Journal of Quantum
Electronics, Vol. 32, pp. 433-441 (1996) [2] G. Morthier et al., A lambda/4-shifted sampled or superstructure grating widely tunable twin-guide laser, IEEE Photonics Technol.
Lett.Vol
. 13, p. 1052-1054,(2001)
[3] J.-O.
Wesström
et al., Design of a Widely Tunable Modulated Grating Y-branch Laser using the Additive
Vernier
Effect for
Improved Super-Mode Selection, accepted to the IEEE International Semiconductor Laser Conference