In fiber communication, optical pulses extend due to dispersion and tend to overlap with adjacent pulse periods. This causes interference between adjacent bits and leads to a high BER.At a high bit rate equal to the pulse width, the bit error rate (due to dispersion) will become too large.The dispersion compensation module (DCM) (also known as the dispersion compensation unit, DCU) contains the optical fiber roller with the dispersion negative slope,with the slope compensation function, it can compensate the wide band dispersion and dispersion slope of the standard single-mode optical fiber (G.652) in the C band, so as to optimize the residual dispersion of the system.It is based on a mature and reliable optical fiber process, which can improve the performance of the optical transmission system. The dispersion range at 1550nm wavelength can reach from-10 to-2100ps/nm, and can provide the central wavelength and dispersion of products with special requirements.

Dispersion compensation module (DCM) is mainly used for DWDM network, also can be said to be mainly used for long-distance network.DCM is deployed everywhere in the network, and modules can easily plug into fiber links because it has fiber connectors for input and output.Insertion loss can be compensated with a fiber optic amplifier. We also often see that the dispersion compensation modules tend to be placed between two fiber amplifiers.

The main component of DCM is DCF, and the dispersion compensation fiber (DCF) is a large negative dispersion fiber.It is a new type of single mode optical fiber designed for the 1.3μm standard single mode optical fiber.In order to adopt WDM/EDFA technology, the working wavelength of the optical fiber must be changed from 1.3μm to 1.55μm, and the dispersion of the standard optical fiber at 1.55μm wavelength is not zero, but positive (17-20) ps/(nm·km), and has positive dispersion slope, which must be added to make dispersion compensation to ensure that the total dispersion of the whole optical fiber line is almost zero, so as to realize high speed, large capacity and long distance communication.

The customer uses the 10G SM 1550nm ZR 80KM optical module, because the actual optical cable distance reaches 120KM, resulting in the optical module can not work normally. In this case, there are two solutions,as follows:

1) In the middle position of the line, increase the OEO, regenerate the optical signal, to achieve the rebirth and recovery of the optical signal, but the disadvantage is that the middle node needs power supply, in fact, it is difficult to find the appropriate position.

2) FiberWDM provide high performance, high reliability EDFA amplifier, can directly amplify the signal at both ends of the room, with FiberWDM passive DCM optical signal compensation, can perfectly solve the user's long distance 120KM transmission needs. This scheme has low cost, no need to find intermediate nodes, and save cost. The application diagram is as follows:

FiberWDM’s DCM module provides a high level of compensation while maintaining lower planar insertion losses and lower latency. When working with the EDFA of FiberWDM, DCM provides a simple, reliable and cost-effective long-distance transportation solution that enables the signal without regeneration.

Welcome back, dear readers !

In our previous article, we unveiled an extraordinary timepiece designed exclusively for Muslim people - the AZAN Watch.

Today, we delve deeper into the functional marvels of  prayer watches that seamlessly blend devotion and technology. Brace yourselves for an enlightening journey into the world of prayer and time !

a. Prayer Time Calculation: Azan watches incorporate sophisticated algorithms to accurately calculate and display the five daily prayer times, taking into account the geographical coordinates of the wearer's location.

b. Azan Alerts: The most distinguishing feature of an Azan watch is the ability to recite the Azan at each prayer time. These watches utilize built-in speakers and pre-programmed audio recordings of various renowned muezzins to deliver the call to prayer. The melodious tones create a serene and spiritually uplifting environment.

c. Qibla Direction: Many Azan watches incorporate a digital compass or a Qibla indicator, enabling the wearer to easily determine the direction of the Kaaba in Mecca, which is the focal point for Muslims during prayer.

d. Prayer Reminders: In addition to the Azan alerts, Azan watches often include customizable alarms to remind the wearer of upcoming prayer times or other significant Islamic events.

e. Other Features: Azan watches may include standard watch functions such as date display, stopwatch, backlight, and multiple time zone settings to accommodate travelers.

In a world where time often engulfs us in a relentless race, Azan watches offer a harmonious balance, guiding us to pause, reflect, and find solace in our faith. This treasured fusion of tradition and technology serves as a testament to the remarkable human capacity to innovate while cherishing the essence of our cultural and religious heritage.

OLED stands for Organic Light-Emitting Diode. OLED displays are a type of flat-panel display technology that is increasingly used in televisions, smartphones, wearable devices, and other electronic devices.

Unlike traditional LCD (Liquid Crystal Display) screens, which require a backlight to illuminate the pixels, OLED displays emit light themselves. Each pixel in an OLED display is made up of organic compounds that emit light when an electric current is applied. This allows for greater flexibility and thinner displays since there's no need for a separate backlight layer.

OLED displays offer several advantages over traditional LCD displays:

Better Picture Quality: OLED displays typically offer deeper blacks and higher contrast ratios compared to LCD screens because OLED pixels can individually turn on and off, resulting in true blacks and more vibrant colors.

Faster Response Time: OLED pixels can switch on and off much faster than traditional LCD pixels, leading to smoother motion and reduced motion blur in fast-paced scenes.

Thinner and Flexible Displays: Since OLED displays don't require a separate backlight layer, they can be made thinner and more flexible than LCD screens. This makes them suitable for curved displays and flexible devices.

Energy Efficiency: OLED displays can be more energy-efficient than LCD screens, especially when displaying dark or black content since OLED pixels emit light only when needed, whereas LCD screens always require a backlight.

However, OLED displays also have some limitations, such as potential issues with burn-in (where persistent images may cause uneven pixel wear) and higher manufacturing costs compared to LCD displays. Despite these limitations, OLED technology continues to improve, and OLED displays remain popular for their superior picture quality and versatility.

We place 2.4G Directional Reader tags or chips on individual items or entire pallets before the goods are put into storage. The 2.4G Directional Reader tag stores important information about the item and helps us quickly count inventory and update location information.

Improve visibility and scan faster. Wireless 2.4Ghz Active RFID Long Distance Reader do not require line of sight to be scanned, so they can be read from a distance, allowing for quick inventory processing. They can also scan in any direction and will update and scan locations more frequently, helping us better understand our inventory.

Reduce labor costs. With labor costs accounting for nearly half of total costs, 2.4G Directional Reader offers huge advantages in this area. Inventory counting is completed quickly with just a few scans, eliminating the need for manual processing. These financial savings create greater profit margins for the company. Track recyclable assets.

For some companies that need to use containers for daily operations, tracking these containers usually requires a lot of manpower and material resources. With 2.4G RFID Directional Integrated Reader, we can track these assets throughout the cycle. This reduces the risk of these circulating capital being stolen and also makes it easier for us to track their location information at any time.

For more than ten years, our company has been focusing on the research, innovation and application of IoT smart device technology. Our R&D team has rich industry experience and independent core technology, and has obtained more than 110 national invention patents and intellectual property rights. Our company has been at the forefront of the market for IoT technology R&D and application integration. And our IoT products and related technologies are serving Huawei, ZTE, SAIC, China Mobile, China Unicom, China Telecom, the United States Flextronics and other domestic and foreign world top 500 customers.

Generally speaking, solar charge controllers are divided into MPPT solar charge controller and PWM solar charge controller. The size of solar charge controller mainly depends on two factors: the current flowing from the solar cell and the voltage connected to the system. Sizing a solar charge controller requires the following steps:

Step 1: Determine solar cell specifications First, you need to determine the wattage, voltage, and current of each solar panel.

Step 2: Match battery voltage Make sure the charge controller voltage matches the battery. If they do not match, it is easy to damage the battery and pose a safety hazard.

Step 3: Calculate maximum current output Calculate the maximum current output in parallel: With a parallel connection, the voltage remains constant as the current accumulates, adding current from each panel. When solar panels are connected in series, the current remains the same but the voltage increases. So if you have solar panels in series, you need to add voltage.

Step 4: Add security scope The safety margin is added to account for increased current due to strong sunlight conditions or other circumstances. A common practice is to add 25%.

Step 5: Consider future expansion We often choose a larger charger than the system we are currently using. This avoids the need to replace a larger charger when the system is expanded, adding a lot of convenience for future expansion.

Cost-Effective:

PWM (Pulse Width Modulation) solar charge controllers are generally less expensive compared to MPPT (Maximum Power Point Tracking) controllers. This makes them an attractive option for smaller or budget-conscious solar power systems .

Simplicity:

These controllers are straightforward in design and operation. Their simplicity makes them easier to install and use, requiring less technical expertise and fewer adjustments than MPPT controllers .

Reliability:

With fewer complex components, PWM controllers tend to have a longer lifespan and are less prone to failure. Their robust design ensures consistent performance over time with minimal maintenance .

Three-Stage Charging:

Many PWM controllers offer a three-stage charging process (bulk, absorption, and float), which optimizes the battery charging process and prolongs battery life by preventing overcharging .

Temperature Compensation:

PWM controllers often include temperature compensation, which adjusts the charging voltage based on battery temperature. This feature helps to optimize battery charging efficiency and extends battery life in various environmental conditions .

Cons

Lower Efficiency:

PWM controllers are less efficient than MPPT controllers, especially in systems where the solar panel voltage is significantly higher than the battery voltage. They do not convert excess voltage into additional current, which can lead to wasted energy ​.

Limited Application:

They are not ideal for larger solar systems or situations where the solar array voltage greatly exceeds the battery voltage. In such cases, MPPT controllers are more effective in harnessing the maximum power from the solar panels .

Performance in Cold Weather:

In cold weather conditions, solar panels typically produce higher voltages. PWM controllers cannot fully utilize these higher voltages, leading to lower overall system efficiency compared to MPPT controllers, which can adapt to these conditions more effectively .

Less Optimal for High Voltage Panels:

When using high voltage solar panels, PWM controllers are not as effective. They are better suited for low voltage solar panels and battery systems, which limits their flexibility in various solar power setups.

No Maximum Power Point Tracking:

Unlike MPPT controllers, PWM controllers do not track the maximum power point of the solar panels. This means they cannot always ensure the most efficient energy harvest, leading to potential energy losses, particularly in systems with varying sunlight conditions.

KOHAN is a professional PWM/MPPT solar charge controller factory. Specializing in providing customized photovoltaic charge controllers to customers around the world. Three-year warranty, feel free to consult!

RFID (Radio Frequency Identification) electronic tag technology and NFCNear Field Communication) technologies are both wireless communication technologies, but they have some differences in working principles, communication ranges and application fields. Let’s find out next.

In terms of working principle, RFID technology uses radio frequencies to transmit data from electronic tags to RFID tag readers. The electronic tag contains a chip and an antenna, through which it receives and sends wireless signals and communicates with the reader. NFC technology is based on RFID technology, but has richer functions. It supports point-to-point communication and is compatible with existing RFID infrastructure. NFC devices can operate as RFID readers or tags, while also enabling direct communication between two NFC devices.

In terms of communication range, the communication range between RFID tags and readers is relatively large, usually up to several meters to tens of meters or even hundreds of meters, and can achieve long-distance identification and tracking. The communication range between NFC devices is usually short, generally within a few centimeters, and the devices need to be close to each other to communicate. This limitation of near-field communication makes NFC more advantageous in terms of security and is suitable for some payment and authentication scenarios.

In terms of application scope, RFID is widely used in supply chain management, inventory control, logistics tracking, asset management and other fields. It can identify and track a large number of items and improve logistics efficiency. NFC is mainly used in mobile payment, access control, smart tags, transportation cards on smartphones, ID cards and other fields. NFC technology allows smartphones to interact with NFC tags or readers, making it convenient for users to perform payment and authorization operations. It is worth mentioning that in many scenarios where NFC is used, RFID can also be used.

Marktrace provides you with many types of RFID tags and 2.4G directional reader to choose from. We are very happy to provide you with perfect RFID solutions, and we have a professional foreign trade team to give you the best purchasing experience.