18650 rechargeable battery lithium 3.7v 3500mah
CH
About Us
Company Profile Development History Sales Network Partner Social Responsibility
Products
Rechargeable Battery Battery Packs Energy Storage Battery Primary Battery Handicraft Article
Subsidiary Company
SINO TECHNOLOGY SUNBEAM GREEN POWER DATAPOWER SEONG-HEE STD
Honor
Qualification Certificate Patent Certificate Honor Certificate
R&D
R&D Center Test Center
News
Company News Industry News
Contact Us
Other information
product
polymer lithium battery Primary battery Rechargeable Battery LR03 alkaline battery
18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

Other information

Home  >  Other information

LR6 alkaline battery.Introduction to CWDM Passive Module Test Solution

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:

502030 200MAH 3.7V

Lithium iron phosphate battery has the following characteristics.portable energy storage battery pow

Development of Lithium Battery Materials

li-ion 18650 battery

18650 battery pack company

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

2023-03-22

li ion 18650 battery pack wholesaler

2023-05-09

home solar energy storage lithium battery Processing

2023-05-10

3.2v 20ah lifepo4 battery cell

2023-03-22

402030 lipo battery company

2023-03-22

Carpet game signs

2022-09-22

701224 145MAH 3.7V

2023-06-10

Ni-MH AAA700mAh 1.2V

2022-07-01

9V card-mounted carbon battery 6F22

2023-06-28

No.1 card-mounted carbon battery R20

2023-06-28

501825 180mAh 3.7V

2022-08-19

18650 2600mAh 3.7V

2022-08-19

R03P

2022-07-01

18650 1800mAh 3.7V

2022-08-19

701224 145mAh 3.7V

2022-08-19

902030 polymer battery

2023-06-25

18650 battery pack 3.7v

2023-06-25

lithium polymer battery 10000mah

2023-06-25

NiMH battery pack

2023-06-25

18650 battery 1800 mah

2023-06-25

3.2v 20ah lifepo4 battery.The principle of charging and discharging of lithium iron phosphate batter

2023-12-04

The Cycle Life of Lithium - Ion Batteries

2025-02-20

Standard conditions for lithium-ion battery industry

2024-06-27

Disadvantages of Lithium - Ion Polymer (Soft - Pack) Batteries

2025-02-22

Custom - shaped Battery Customization Services

2025-03-14

Some performance requirements of high magnification batteries.902030 polymer battery

2023-05-18

What are the models of cylindrical lithium batteries?

2022-12-01

What are the characteristics of RC racing battery charger?household energy storage lithium battery m

2023-04-19

Demystify a few tips for extending the service life of mobile phone batteries

2023-02-10

Current status of lithium iron batteries.LR621 battery

2023-05-25
360° FACTORY VR TOUR
lithium ion battery 18650 priceWhatsapp
lithium ion battery 18650 price

lithium ion battery 18650 priceTel
+86 19925278095

lithium ion battery 18650 priceEmail
admin@sino-techgroup.com

TOP