What is G-lens/C-lens?

Optical components such as G-lens and C- lens have been seen in optical communication. It is unknown so let's sort them out today. C- lens is a traditional lens, that is, a spherical lens (conventional lens); G-lens is a self-focusing lens, also known as a ladder analysis lens (Gradient-index,GRIN). Both C- lens and G-lens have focusing and imaging capabilities, and G-lens are highlighted here. The G-lens is a cylindrical optical lens whose refractive index distribution gradually changes along the radial direction.

2023-08-16

The working principle of fiber collimator

The fiber collimator is precisely positioned by the pigtail and the self-focusing lens. It can convert the transmitted light in the optical fiber into collimated light (parallel light), or couple the external parallel (approximately parallel) light into a single-mode optical fiber. Fiber collimator through the lens can be realized from the divergence angle is larger (small beam waist) beam into the divergence angle is smaller (large beam waist) beam, so as to lower the loss of coupling into other optical devices.

2023-08-16

One article to understand what is optical communication?

1. what is optical communication? Optical communication is a communication method that uses optical signals to transmit information. It is a high-speed, large capacity, low loss, strong anti-interference ability of communication, has become one of the important technologies in the field of modern communication. In optical communication, the light source converts information into an optical signal, transmits it through an optical fiber, and the receiving end converts the optical signal into an electrical signal for decoding. Optical communication is widely used in telecommunications, the Internet, data centers, medical, radio and television and other fields. With the continuous advancement of technology, the transmission rate and capacity of optical communication continue to increase, bringing more convenience to people's lives and work. The advantages of optical communication: (1) huge communication capacity In theory, an optical fiber can transmit 10 billion channels at the same time. At present, the experiment of transmitting 500000 channels at the same time has been successful, which is thousands or even hundreds of thousands of times higher than traditional coaxial cable and microwave. (2) Long relay distance Optical fiber has a very low attenuation coefficient. With appropriate optical transmission, optical receiving equipment, optical amplifier, forward error correction and other technologies, the relay distance can reach thousands of kilometers, while the traditional cable can only transmit 1.5km and microwave 50km, which can not be compared with it at all. (3) strong adaptability It has the advantages of not afraid of strong external electromagnetic field interference and corrosion resistance. (4) good confidentiality performance (5) Small size and light weight Disadvantages of optical communication: (1) The optical fiber structure is relatively fragile, the mechanical strength is poor, and it needs protection (2) High technical requirements for fiber cut and connection operations (3) Shunt, coupling operation is more cumbersome Development History of 2. Optical Communication Optical communication began to develop in the 1960 s and grew rapidly in the coming decades. The following are the key historical nodes of optical communication: In the 1960 s, the development of optical communication began in the 1960 s, starting with point-to-point communication through laser beams in the air. In the early 1970 s, optical communication began to be used for long-distance telephone communication, but the manufacture of optical fiber materials and the progress of light source technology are still the main difficulties. In the 1980 s, optical communication entered a period of rapid development. With the manufacture of optical fiber materials and the continuous improvement of light source technology, the transmission rate and transmission distance of optical communication have been significantly improved. In the 1990 s, optical communication technology was widely used, especially in the development of the Internet. In 1997, the global optical communications market was worth more than $10 billion billion. In the 2000 s, optical communication technology further improved the transmission rate and transmission distance, such as Wavelength Division Multiplexing(WDM) technology, which can simultaneously transmit multiple optical signals of different wavelengths on an optical fiber, greatly improving the transmission capacity and efficiency of the optical fiber. In the 2010 s, optical communication technology has become an indispensable part of modern communication field, widely used in telephone, broadband, mobile communication and other fields. At the same time, optical communication technology has also begun to be applied to smart home, intelligent transportation, smart home and other fields. Principles of 3. Optical Communication Optical communication uses the transmission characteristics of light to convert information into optical signals, transmit them through optical fibers, and then convert the optical signals into electrical signals for decoding. The main equipment of optical communication includes light source, optical fiber, optical receiver and so on. The light source may be a laser, a light emitting diode, or the like. The light pulse signal is generated by controlling the switching of the light source and the intensity of the light through an electrical signal. These signals are transmitted through the optical fiber to the receiving end, and the optical signal is converted into an electrical signal through the optical receiver. Application Scenarios of 4. Optical Communication Telecommunications: Optical communication technology has become one of the important technologies in the field of telecommunications, widely used in telephone, broadband, mobile communications and other fields. Data center: Data center needs high-speed and large-capacity data transmission. Optical communication technology can meet this demand and improve data transmission rate and capacity. Medical field: optical communication technology can be used for medical diagnosis and treatment, such as optical coherence tomography (OCT) technology can be used for diagnosis in ophthalmology, dermatology and other fields.

2023-08-16

Our lenses adopt advanced manufacturing technology and precision machining technology, with excellent optical performance and stable quality

Dear customers, thank you for choosing our products. We are a company specializing in the sale of lenses, providing you with high-quality, reliable and excellent performance lens solutions. Our lens adopts advanced manufacturing technology and precision processing technology, with excellent optical performance and stable quality. Our products cover a wide range of applications, including photography, microscopy, lasers, machine vision, etc. Whether you are a professional photographer or a professional in industrial applications, we can provide you with the lens solution that best suits your needs. We are committed to providing our customers with excellent service and a perfect shopping experience. No matter you have any problems in product selection, technical consultation or after-sales service, our professional team will be happy to provide you with support and assistance. As a company specializing in selling lenses, we not only provide high-quality products, but also devote ourselves to continuous innovation and progress. We cooperate with well-known manufacturers at home and abroad, keep up with the pace of technological development, and continue to introduce new products to meet the changing needs of customers. When you choose our lens products, you choose quality assurance, professional service and excellent performance. We will always be committed to providing you with the best lens solutions. Thank you for your trust and support. We look forward to cooperating with you!

2023-08-16

CWDM or CWDM or FWWDM orLWDM

WDM (Wavelength Division Multiplexing), bearing schemes include coarse wavelength division multiplexing (CWDM), dense wavelength division multiplexing (DWDM), medium wavelength division multiplexing (MWDM), and fine wavelength division multiplexing (LWDM). The following is a description of each program. 1. CWDM (Coarse Wavelength Division Multiplexer) CWDM(Coarse Wavelength Division Multiplexer) is a sparse wavelength division multiplexer, also known as a coarse wavelength division multiplexer. CWDM has 18 different wavelength channels, the different wavelengths of each channel are separated by 20nm, using wavelengths from 1270 nm to 1610 nm. CWDM supports fewer channels than DWDM because it is compact and cost-effective, making it an ideal solution for short-range communications. The biggest advantage of the CWDM system is its low cost, and the cost of the device is mainly reflected in the filter and laser. The wide wavelength interval of 20nm also brings the advantages of low requirements on the technical specifications of the laser and simplified structure of the optical multiplexer/demultiplexer to the CWDM. The structure is simplified, the yield is improved, so the cost is reduced. 2. DWDM (Dense Wavelength Division Multiplexer) DWDM(Dense Wavelength Division Multiplexer) is a dense wavelength division multiplexer. The channel spacing of DWDM is 1.6/0.8/0.4 nm(200GHz/100 GHz/50 GHz), which is much smaller than CWDM. Compared with CWDM, DWDM with tighter wavelength spacing can carry 8 to 160 wavelengths on one optical fiber, which is more suitable for long-distance transmission. With the help of EDFA, DWDM systems can work over thousands of kilometers. 3. FWDM (Filtered Chip Wavelength Division Multiplexer) FWDM(Filter Wavelength Division Multiplexing) filter chip wave division multiplexer, is based on the mature membrane filter technology. The filter-type wavelength division multiplexer can combine or separate light of different wavelengths in a wide wavelength range, and is widely used in erbium-doped optical amplifiers, Raman amplifiers and WDM optical fiber networks. 4. MWDM (Medium Wavelength Division Multiplexer) MWDM reuses the first 6 waves of CWDM, compresses the wavelength interval of 20nm of CWDM to 7nm, and uses TEC(Thermal Electronic Cooler, semiconductor refrigerator) temperature control technology to realize 1 wave expansion into 2 waves. In this way, the capacity improvement can be realized and the optical fiber can be further saved. MWDM is based on the CWDM 6 wave, the left and right offset 3.5nm is expanded to 12 waves (1267.5, 1274.5, 1287.5, 1294.5, 1307.5, 1314.5, 1327.5, 1334.5, 1347.5, 1354.5, 1367.5, 1374.5nm). 5. LWDM (Fine Wavelength Division Multiplexing) LWDM is a wavelength division multiplexing Lan-WDM technology based on Ethernet channels, also known as fine wavelength division multiplexing. Its channel spacing is 200~800GHz, this range is between DWDM(100GHz, 50GHz) and CWDM (about 3THz). LWDM uses 12 wavelengths in the 1269nm to 1332nm band in the O-band(1260nm to 1360nm) range, and the wavelength interval is 4nm(1269.23, 1273.54, 1277.89, 1282.26, 1286.66, 1291.1, 1295.56, 1300.05, 1304.58, 1309.14, 1313.73, 1318.35nm). The working wavelength of LWDM is characterized by being located near zero dispersion, small dispersion and good stability. At the same time, LWDM can support 12 waves 25G, capacity increase, can further save fiber.

2023-08-16