Affecting the performance index of WDM wavelength division multiplexer
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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 can be enhanced by adding more channels. The 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, which can be used to prevent inter-channel interference. According to ITU-TG. According to the proposal of 692, there are 100GHz (0.8nm), 50GHz (0.4nm) and 2 5GHz Hz with intervals less than 200GHz (1.6nm), etc. Currently, 200GHz and 100GHz channel intervals are preferred.
3. Insertion loss IL
Insertion loss is the attenuation caused by the insertion of a wavelength division multiplexer (WDM) in an optical transmission system. The attenuation effect of the wavelength division multiplexer itself on the optical signal directly affects the transmission distance of the system. In general, the lower the insertion loss, the less signal attenuation.
4. Isolation ISO
Isolation refers to the degree of isolation between signals of each channel. A high isolation value can effectively prevent crosstalk between signals and cause transmission signal distortion.
5. Polarization dependent loss PDL
Polarization-dependent loss PDL is the ratio of the maximum power to the minimum power after different polarization states pass through the device under test. PDL means that the loss characteristic is related to the polarization state, and the loss of different polarization states is different, which reflects the sensitivity of a device to the polarization state, and has become an important indicator in the field of optical fiber communication.
In addition to the above, there are of course other performance parameters that affect WDM devices, such as operating temperature and bandwidth.
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