Description and Application
Dense wavelength division multiplexer (DWDM for short) uses the bandwidth of single-mode fiber and the characteristics of low loss, using multiple wavelengths as carriers, allowing each carrier channel to be transmitted simultaneously within the fiber.The number of channels in DWDM is much larger than that of CWDM, and the wavelength spacing is generally 0.2nm~1.2nm.The DWDM system provides a single-fiber transmission capacity of 16/20 or 32/40 waves, up to 160 waves, with flexible scalability. DWDM system can provide 16/20 waves or 32/40 waves of single fiber transmission capacity, the maximum can be up to 160 waves, with flexible expansion capability. Compared with the general single-channel system, dense WDM (DWDM) not only greatly improves the communication capacity of the network system, making full use of the bandwidth of the optical fiber, and it has a number of advantages such as simple expansion and reliable performance, in particular, it can be directly accessed to a wide range of services makes it a very bright prospect for application.
Features: ①Large equipment capacity ②Low insertion loss ③High channel isolation ④High stability and reliability ⑤Multi-rate service access ⑥Good scalability | Applications: ①Fiber optic CATV system ②Metropolitan Area Network/Access Network ③Optical line terminals ④Optical network unit |
Parameters
| Parameters | Norm | |
| Channel number | 20/40 | |
| Transmission wavelength(nm) | 1525~1565 | |
| Insertion loss（dB） | ≤0.6 | |
| Insertion loss fluctuation(dB) | ≤0.30 | |
| Degree of isolation(dB) | Adjacent passage | ≥25 |
| Non-adjacent channel | ≥30 | |
| -1dB Bandwidths | ≥0.4 | |
| -3dB Bandwidths | ≥0.6 | |
| Return loss(dB) | >50 | |
| Temperature sensitivity(dB/℃) | <0.005 | |
| Polarization-related losses(dB) | <0.10 | |
| Polarization mode dispersion loss(Ps) | <0.10 | |
| Directionality(dB) | ≥50 | |
| Operating temperature(℃) | -20~70 | |
| Storage temperature(℃) | -40~85 | |
