Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-03-04 Hits: Popular:AG11 battery
The price of CWDM system is much lower than that of DWDM system. Because CWDM has small power, small size and easy use, the cost of supporting facilities, personnel training and later maintenance is lower. Compared with optical cable engineering: the use of CWDM equipment is quick to open, low cost, and convenient for later network upgrades. You can directly add the required signals or replace higher-speed products without changing the optical fiber links. The network upgrade is simple and reduces the network cost. Upgrade costs. At present, DWDM technology has been widely used in long-distance high-speed optical communication systems such as national backbone networks and submarine optical cable communication systems. However, due to its complex technology and high cost, DWDM is not suitable for use in metropolitan area networks and access networks. Different from the DWDM system, the CWDM system uses a distributed feedback (DFB) laser and a broadband optical filter without a cooler. Therefore, the CWDM system has the following advantages: low power loss, small size and low cost. The launch of the CWDM system on the market enables it to replace the DWDM system in metropolitan area networks and access networks. Currently, most CWDM systems operate in the range from 1470nm to 1610nm, with a channel spacing of 20nm. The current technologies for making CWDM include thin film filters (ThinFilmFilter, TFF) and all-fiber couplers (AllFiberCoupler). Regardless of the manufacturing method of CWDM devices, there is the same very important issue: testing of technical indicators. These indicators include insertion loss, channel bandwidth, isolation, passband flatness and other important indicators. Since CWDM covers a very wide wavelength range (>140nm), the test is relatively complex. The test methods include the following: 1. Use white light source as the test light source
Advantages: The wavelength coverage of white light source is very wide. Disadvantages: The power density of the white light source is very small, <-55dBm/nm, so the isolation index test can only reach about 20dB, which is difficult to meet the requirements.
2. Advantages of using 1550nm LED light source as the test light source: LED light source has a wider wavelength coverage and is cheaper. Disadvantages: The power density of the LED light source is small, in the range of -40~-50dBm/nm, so the isolation index test can only reach about 20~30dB. Of course, if the spectrometer uses a high-sensitivity scanning method, it can also reach 30~40dB. However, there is a problem of low test efficiency (it takes about 5 minutes to scan a channel).
3. Advantages of using tunable laser as test light source: pDL, return loss and other indicators can also be tested. Disadvantages: Generally, the wavelength of a single tunable laser cannot cover the required range of CWDM, so two are needed; in addition, a higher-end tunable laser must be selected, otherwise the isolation index of a general tunable laser can only be measured due to the influence of ASE. About 30dB. In addition, the test speed is slow, the efficiency is low, the cost is high, and the test curve is easily affected by pDL.
4. Advantages of using S+C+L broadband light source (SLD) as the test light source: high test efficiency and intuitive results (recommended first choice). http://www.opeak.com.cn
5. Using ASE-C+L broadband light source as the test light source, and then scanning with a spectrometer has the following advantages: high test efficiency, intuitive results, and moderate cost. It is the most commonly used test solution. The ASE-C+L broadband light source approximately covers the wavelength range of 1520~1620nm. In this range, the optical power density is approximately 3 orders of magnitude greater than that of the LED light source (refer to Figure 1). Therefore, the isolation index of CWDM can be measured to more than 50dB. . Disadvantages: The light in the 1470~1520 band is weak, but it still has some light. Its optical power density is equivalent to that of the LED light source. The isolation index can be measured to about 20~30dB. Of course, high-sensitivity scanning methods can also be used to improve the test isolation. Spend.
Note: The above describes the measurement method for CWDM modules. Similar measurement methods can also be used for CWDM thin film filters, CWDM fiber couplers and other devices, which should be simpler.
Read recommendations:
Lithium iron phosphate battery has the following characteristics.portable energy storage battery pow
Last article:AG10 battery.Causes and causes of unbalanced current in transformer differential protection
Next article:LR6 battery.New transformers for urban power grids and related technical issues
Popular recommendation
601848 battery sales
2023-03-22li ion 18650 battery pack wholesaler
2023-05-09home solar energy storage lithium battery Processing
2023-05-103.2v 20ah lifepo4 battery cell
2023-03-22402030 lipo battery company
2023-03-22Carpet game signs
2022-09-22701224 145MAH 3.7V
2023-06-10Ni-MH AAA700mAh 1.2V
2022-07-019V card-mounted carbon battery 6F22
2023-06-28No.1 card-mounted carbon battery R20
2023-06-28501825 180mAh 3.7V
2022-08-1918650 2600mAh 3.7V
2022-08-19R03P
2022-07-0118650 1800mAh 3.7V
2022-08-19701224 145mAh 3.7V
2022-08-19902030 polymer battery
2023-06-2518650 battery pack 3.7v
2023-06-25lithium polymer battery 10000mah
2023-06-25NiMH battery pack
2023-06-2518650 battery 1800 mah
2023-06-253.2v 20ah lifepo4 battery.The principle of charging and discharging of lithium iron phosphate batter
2023-12-04The Cycle Life of Lithium - Ion Batteries
2025-02-20Standard conditions for lithium-ion battery industry
2024-06-27Disadvantages of Lithium - Ion Polymer (Soft - Pack) Batteries
2025-02-22Custom - shaped Battery Customization Services
2025-03-14Some performance requirements of high magnification batteries.902030 polymer battery
2023-05-18What are the models of cylindrical lithium batteries?
2022-12-01What are the characteristics of RC racing battery charger?household energy storage lithium battery m
2023-04-19Demystify a few tips for extending the service life of mobile phone batteries
2023-02-10Current status of lithium iron batteries.LR621 battery
2023-05-25