SEMINAR ON TUNABLE LASERS : In a wavelength division multiplexing (WDM) transmission systems 128 wavelengths information, we have 128 different lasers in which these specific wavelengths of light. Each laser has been designed differently to give the exact wavelength. Although Lasers are expensive, in case of failure, we must be able to replace a immediately, so that you do not lose any ability we have invested so much money to take stock of spare lasers of 128 or 256 maybe, just to be ready for double faults. What if we have a laser printer to the optical network can be adapted to replace a series of laser wavelengths of total 128? Think the money could be saved, and storage space for parts. What is needed for This "tunable laser"
The tunable lasers are still a relatively young technology, but the number of wavelengths in the network increases, and its importance. Each different wavelength optical network is separated by a multiple of 0.8 NM (sometimes as 100GHz space. Current commercial products can meet maybe four of these wavelengths simultaneously. Although not ideal, is still cutting the required number of Lasers additional down. More sophisticated solutions hope to cover more wavelengths, and should reduce the cost of spare parts even more. The devices are still based on semiconductor lasers, which operate on similar principles to a non-tunable versions. Most models have some kind of Grid as a distributed feedback laser. These networks can be modified to change the wavelength of reflected laser cavity, usually running electric current through them, changing its refractive index. The adjustment range of these devices can be as high as 40 nm, which would cover the 50 different wavelengths in a 0.8Nm system spacing wavelength. Technology based on vertical cavity surface emitting laser (VCSEL) to include a hollow movable end up changing the cavity length and therefore the emission wavelength. Current models are similar to tunable VCSELs adjustment ranges.
The tunable lasers are still a relatively young technology, but the number of wavelengths in the network increases, and its importance. Each different wavelength optical network is separated by a multiple of 0.8 NM (sometimes as 100GHz space. Current commercial products can meet maybe four of these wavelengths simultaneously. Although not ideal, is still cutting the required number of Lasers additional down. More sophisticated solutions hope to cover more wavelengths, and should reduce the cost of spare parts even more. The devices are still based on semiconductor lasers, which operate on similar principles to a non-tunable versions. Most models have some kind of Grid as a distributed feedback laser. These networks can be modified to change the wavelength of reflected laser cavity, usually running electric current through them, changing its refractive index. The adjustment range of these devices can be as high as 40 nm, which would cover the 50 different wavelengths in a 0.8Nm system spacing wavelength. Technology based on vertical cavity surface emitting laser (VCSEL) to include a hollow movable end up changing the cavity length and therefore the emission wavelength. Current models are similar to tunable VCSELs adjustment ranges.
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