The technology of simultaneously transmitting information of two or more optical wavelength signals through different optical channels in the same fiber is called wavelength division multiplexing (WDM). WDM (Wavelength Division Multiplexing) is to combine two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end through a multiplexer, and couple them into the same fiber for transmission. , and at the receiving end, the optical signals of various wavelengths are separated by a demultiplexer, and then further processed by the optical receiver to restore the original signal. So what are the performance indicators that affect the WDM wavelength division multiplexer? We will provide you with the most ideal wdm solution here.

1. Working band

The working band of WDM devices, such as 1550 wavelength, distinguishes three bands: S band (short wavelength band 1460~1528nm), C band (conventional band 1530~1565nm), L band (long wavelength band 1565~1625nm).

2. Number of channels and channel spacing

The number of channels refers to the number of channels that can be synthesized or separated by the wavelength division multiplexer/demultiplexer. This number can vary from 4 to 160. The design is enhanced by adding more channels. Common channel numbers are 4, 8, 16, 32, 40, 48, etc. Channel spacing refers to the difference between the nominal carrier frequencies of two adjacent channels and can be used to prevent inter-channel interference. According to the recommendation of ITU-T G.692, there are 100GHz (0.8nm), 50GHz (0.4nm) and 25GHz with the spacing less than 200GHz (1.6nm), and the channel spacing of 100GHz and 50GHz is currently preferred.

3. Insertion loss

Insertion loss is the attenuation caused by the insertion of a wavelength division multiplexer (WDM) in an optical transmission system. The attenuation of the optical signal by the wavelength division multiplexer directly affects the transmission distance of the system. In general, the lower the insertion loss, the less the signal is attenuated.

4. Isolation

The isolation degree refers to the isolation degree between the signals of each channel, and a high isolation degree value can effectively prevent the crosstalk between the signals from causing the distortion of the transmission signal.

5. Polarization Dependent Loss PDL

The polarization dependent loss PDL is the distance between the maximum and minimum Loss caused by different polarization states at a fixed temperature, wavelength and the same Band, that is, the maximum deviation of insertion loss under all input polarization states.

In addition to the above, of course, there are other performance parameters that affect the WDM network, such as operating temperature, bandwidth and so on. Any of your requests is welcomed and we will reserve our best attention.