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Mainly as a 2.5Gb / s SDH systems and WDM systems transmit and channel monitoring light source. (3) the QW DFB lasers, high-power highly linear 1.3 m strain 1997, small quantities for use in CATV optical transmitter. The devices under development are: (1) 1.3 m, 1.55 m AlGaInAs high temperature without refrigeration strained QW lasers, "863" project. (2) 1.3 m, 1.55 m compensation strain of InGaAsP QW semiconductor laser amplifier, "863" project. 2.5 Gb / s used in the QW the DFB laser and electrical absorption modulator of monolithic optical integrated devices. QW lasers is the development of key components in high-speed optical fiber communication system at the country urgently needed. The economical efficiency of led stage lighting packages is the key point.
The key technology breakthrough, greatly promoted the development of optical fiber communication technology in China. Distributed feedback (DFB) laser DFB laser line width of less than 0.04nm, and the DFB laser wavelength drift with temperature is relatively small, and has a high side mode suppression ratio. These features make the DFB laser is very suitable for dense wavelength division multiplexing (DWDM) communication applications. (1) gain-coupled DFB laser gain-coupled DFB lasers due to its launch mode falls center on the fundamental mode from the physical to ensure it is bound to a single longitudinal mode of action, single longitudinal mode yield high refraction than the commonly used rate coupled DFB production process more difficult, the cost is relatively low. led stage lighting packages can be used to point at the star.
It also has other advantages, such as the inhibition of the back reflected light. The most mature device materials system, the most important InGaAsP / InP the MQW material. Electroabsorption modulated DFB laser (EML): a directly modulated DFB lasers by the effect of the relaxation oscillation limit, the response rate is difficult to cross the 5 Gb / s, while in the high-speed, accompanied by a large positive chirp and negative chirp, reduce the transmission performance. Directly modulated DFB lasers is usually the introduction of the MZ modulator and electro-absorption modulators of these two modulators, to consider from the optical network system, the modulator should be a simple structure and to achieve a monolithically integrated with DFB lasers. Electro-absorption modulators more attractive than the MZ modulator is because it can be integrated with DFB laser monolithic compact. Actually, the double-colored led stage lighting packages is the favorite of the customer in the current market.
And eliminates the need for polarization control. Korea University Institute of Radio Engineering developed the integration of optical communication systems for high bit rate and long drag 10Gb / s electro-absorption modulated DFB lasers to achieve a lossless transmission over 130km standard fiber. (3) tunable DFB laser German scientists recently demonstrated a cheap adjustable across the entire visible spectral region of the DFB thin film of organic semiconductor lasers. This DFB emission wavelength range is controlled by the thickness of the film. Thin film materials for the Alq: DCM. And polyethylene flexible sheet on benzene dimethylene (PET) as a substrate. Scientists based on the Alq. The top seller of Laser Pointers in the oversea market should be respectively summarized.
DCM films with different thickness (from 120nm to 435 nm) produced several DFB lasers. When the film thickness of 120 nm, the laser wavelength is 604 nm; thickness of 435 nm, the laser wavelength to 648 nm. Continuous tuning range of 30nm. (4) fiber grating DFB lasers to fiber Bragg grating external cavity semiconductor laser reflector, can the system performance of fiber grating DFB lasers. This laser is not only the output laser line width, easy coupling with optical fiber, but also through the grating to the longitudinal tensile force or change the frequency and pattern of the modulation frequency of the LD will be able to control the output laser. Fiber grating DFB lasers. They might require differently towards the appearance and technology design of led stage lighting packages.