The magnitude of increase in fiber optic transmission capacity

laser pointer has the high cost performance.
CATV optical networks, in order to ensure the uninterrupted operation of cable systems should be equipped with backup optical transmitter, when the working of the optical transmitter failure, the use of optical switches within a very short time the backup optical transmitter access system, to ensure their normal work. According to their works, the optical switch can be divided into mechanical and non-mechanical two categories. Mechanical optical switches rely on optical fiber or optical components to move the optical path to change the light switch on the market today is generally a mechanical advantage of a low insertion loss, generally less than 1.5dB; high isolation, typically greater than 45dB, free from polarization and wavelength. Non-mechanical optical switches rely on electro-optic effect, magneto-optical effects, sound and light effects, as well as thermo-optic effect to change the waveguide refractive index, so that the optical path to change. The customer can focus the energy of laser pointer .
This is also a new technology, the advantages of these switches are: the switching time is short, small size, ease of optical integrated optoelectronic integrated; the inadequacies of the insertion loss, isolation, low. Within an optical fiber for simultaneous transmission of several different wavelengths of light signal communication received WDM do, using WDM technology, as long as a small amount of co-wave transmitter and the receiver, sub-wave devices, you can The magnitude of increase in fiber optic transmission capacity and increase economic efficiency. Fiber optic cable has been laid, the use of WDM technology, multiplexing, and play a role in lower costs and expand capacity. WDM in the optical path to play the role of co-wave and sub-waves. The user can adjust the emitted laser beam light of laser pointer .The customer should protect themselves especially their eyes with goggle of laser pointer
It brings together the different wavelengths of light signals (wave) to an optical fiber transmission to the receiving end, again by the multiplexed optical signal to the optical fiber transmission separation out. Can be divided into branches mirror type, according to the spectrophotometric principle, WDM interference model and the diffraction grating are three products on the market most of the diffraction grating. The main indicators of the WDM insertion loss, crosstalk loss, wavelength interval and mpx. The insertion loss of the use of WDM and optical power loss is generally about-5dB. Crosstalk loss represents the WDM separated on the wavelength.