Get to know few Facts about Optical Attenuator

In a fiber optic communication system an optical attenuator is an electronic device commonly used to decrease the level of power of an optical signal. In fiber optics, attenuation is also called transmission loss.

Concerning the distance traveled by the signal in a transmission medium, it is the reduction in light signal intensity. To limit the transmission of a digital signal traveling in large distances, attenuation is an important element. As optical attenuator travels along with free space or an optical fiber it reduces this optical signal.

When used in fiber optic communications optical fiber attenuators may employ several principles. The gap loss principle is one common principle. Attenuators using this principle are sensitive to the modal distribution ahead of the attenuator. Thus, they should be utilized near or at the transmitting end. If not, the attenuators can establish less loss than intended.

Three basic types of optical attenuators are the fixed attenuator, step-wise attenuator, and the continuously variable attenuator. You can buy an optical circulator online.

Light signals are reduced by fixed attenuators by a specific amount with negligible or no reflection. As signal reflection is not an issue, fixed attenuators are known for more accurate data transmission.

With fixed attenuators, the important elements associated are the amount of attenuation, flatness over a specified frequency, range, average and peak power-handling capability, performance over a specific temperature, voltage standing wave ratio (VSWR), size, and height.

In an electronic circuit, fixed attenuators are also often used to enhance interstage matching. The optical isolator is also much in demand.

In variable optical attenuators (VOA), resistors are replaced with solid-state devices such as and PIN diodes the metal-semiconductor a field-effect transistor (MESFETs). VOA attenuates beam or light signal that to in a controlled manner, resulting in the production of an output optical beam with different attenuated intensity.

To regulate optical power levels VOA is usually used in fiber optic communication systems so that it can prevent damages in optical receivers which may be due to irregular or fluctuating power levels. Depending on the manufacturing technology used the price of commercial VOA varies. Some of the manufacturers of VOA are Timbercon and Arcoptix.

What is Single fiber CWDM MUX and DEMUX

In CWDM systems, bidirectional CWDM MUX DEMUX (likewise called double fiber CWDM MUX DEMUX) utilizes similar wavelengths for transmitting and getting. It is frequently utilized in double manner transmission applications. The working standard is straightforward. A duplex fiber link joins two double fiber CWDM MUX DEMUXs supporting similar wavelengths introduced on each end of the fiber optic arrangement. The wavelengths of the two strands are the equivalent, yet they are running on the various headings for duplex transmission. In any case, now and again, there is just a single fiber accessible for organizing limit extension. At that point, single fiber CWDM MUX and DEMUX is being utilized, which is altogether different from the double fiber one.

The single-fiber CWDM MUX DEMUX has a simplex line port (appeared in the above picture), which is the greatest contrast from the bidirectional CWDM MUX DEMUX on the appearance. There are additionally some single fiber CWDM MUX and DEMUX that are made with a duplex port. In any case, just one port of this duplex port is being used, the other is generally set apart with N/A. For example, our FMU single fiber CWDM MUX DEMUX additionally utilizes this structure.

The motivation behind why single fiber CWDM MUX and DEMUX can accomplish double way transmission is on the grounds that it utilizes the CWDM wavelengths in an alternate route contrasted and the bidirectional CWDM MUX DEMUX. In bidirectional CWDM organize, every wavelength runs on two inverse bearings. Be that as it may, in a single fiber CWDM arranges every wavelength just sudden spikes in demand for one heading. In different works, on the off chance that you need to assemble a double way transmission connect between two destinations, you can utilize one wavelength over duplex fiber with double fiber CWDM MUX DEMUX, or utilize two wavelengths (one for TX and the other for RX) over simplex fiber with single-fiber CWDM MUX DEMUX. The above picture shows how CWDM wavelengths are utilized in a solitary fiber CWDM arrangement. In this system, 16 wavelengths are utilized to help 8 sets of double way transmission. On location A, there sent an 8-channel single fiber CWDM MUX DEMUX utilizing 8 wavelengths for transmitting and the other 8 wavelengths forgot. On the contrary site B, likewise a solitary fiber CWDM MUX and DEMUX are conveyed. Be that as it may, the wavelengths for TX and RX are turned around. For example, a couple of double way signal uses 1270nm for TX and 1290nm for RX on location, some time utilize 1290nm for TX and 1270nm for RX on location B. This is the means by which the single-fiber CWDM MUX and DEMUX accomplishing double way transmission.

Please Follow Us on Facebook and Twitter