In recent years, the semiconductor laser develops rapidly. For its high reliability, longlife, low cost, small in size, high performance, it’s widely used on the optical fiber sensing,optical communications, radar and so on. Generally semiconductor laser linewidth reaches afew hundred KHz and its phase noise is very high, which limits application in all fields. Soreduction
(Read More…)
With the cold atomic interferometer at home and abroad, to the measured precision (accuracy and stability) and miniaturization pursuit more and more high, this to the semiconductor laser put forward higher request. This issue analyzes the main form of semiconductor laser parts, improved the dc voltage source, a current source and temperature control system.From the
(Read More…)
Chaotic signals that result from chaotic dynamical systems are the families of stochastic signals.They are sensitive to initial conditions and look like “noise” in time domain.Because of the noise-like feature,chaotic signals usually occupy a wide bandwidth in frequency domain.Wideband chaotic signal is an ideal signal in radar system for its noise-like behavior and good self-correlation
(Read More…)
Online detection of the steel plate’s flatness is applied widespread and valuable in the manufacturing production.Measurement using CCD and linear laser has the virtues of non-contact,high accuracy,convenient for computer processing and easy to control.For this reason,research on the laser flatness gauge of the steel plate has high practical application value and good prospects.The paper designed
(Read More…)
In recent years, wireless laser communications technology has become practical gradually,and it not only could provide similar optical fiber transmission rate, but also do not need, such as microwave communications,large initial investment in the aspects of scarce resources spectrum.Therefore,the prospect of wireless laser commu- nication must become much broader,whether in the military or commercial application.In
(Read More…)
Distributed Feedback Laser Diodes (DFB-LD) relatively are inexpensive and have good frequency response and direct modulation characteristics, so DFB-LD become an irreplaceable source in the optical fiber communications and CATV. Although the DFB-LD shows the relatively good frequency response characteristics, the presence of relaxation oscillation peak limits the wide application of DFB-LD. In this paper,
(Read More…)
Optical locating is an important use of photoelectric technology, its actual value and scientific significance will be invaluable and it can be widely used for industry, communications, medical sciences,military, scientific research and many fields. This thesis deeply analyses the newest literature from domestic and overseas. To derive the location measuring principle of detector’s locating system
(Read More…)
Nowadays, semiconductor laser technology has become more and more mature, their application in optical communication networks gradually increases, but with the new emerging technology, especially wavelength division multiplexing (WDM) optical communication technology used in wide areas. This makes people propose a higher demand for the source of optical communication.In this paper, a new type of
(Read More…)
As an excellent and easily experimentally realizable example of coupled nonlinear oscillators, mutually coupled semiconductor lasers system (MCSLs) have attracted much attention because of their wide applications in varies aspects such as achieving high output power in lasers array, optical memories and chaos secret communication. Previous relevant studies on MCSLs mostly focus on particular nonlinear
(Read More…)
With its small size, low price and high efficiency, good reliability, long working life and excellent color adjustable feature ,Laser diode (LD) is more widely used in national defense, scientific research, medical, processing and other fields. With the wide spread application of semiconductor laser, its drive power requirements are increasing. The traditional power semiconductor lasers
(Read More…)
