Optical Components
D-NET, a Guangdong-based high-tech enterprise established in 2015, stands as a renowned Chinese manufacturer and supplier in the field of optical fiber communication. With a capital investment of 15 million yuan and a workforce exceeding 80 employees, our factory produces advanced optical signal transmission products tailored for sectors such as telecommunications, finance, academia, and data centers. Backed by a professional R&D team, D-NET offers one-stop services, ensuring top-notch quality and ultimate customer satisfaction through our superior technology, state-of-the-art equipment, and rigorous management practices. As a trusted manufacturer and supplier in China, we strive to meet the diverse needs of our valued customers.
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High Quality
Our products are manufactured or executed to very high standards, using the finest materials and manufacturing processes.
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Long Warranty
All the products we provide have 3-month replacement, 3-year warranty and lifetime maintenance service Make consumers more at ease.
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One-stop Solution
We can provide customers with a full range of product solutions services, free wave division transmission scheme design services.
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We strictly control every production process of the product, after strict testing and inspection, to ensure the quality of the product.
What is Optical Passive Component
Optical passive component is a device that consumes a certain amount of energy and has certain functions without light-electric or electric-optical conversion.Including optical fiber connector, optical fiber coupler, wave division multiplexer, optical switch, optical attenuator and optical isolator, is the joint of the optical transmission system. It has the characteristics of high echo loss, low insertion loss, high reliability, stability, mechanical wear resistance and corrosion resistance, and easy operation.
Features of Passive optical component
High reliability
Passive optical components do not have moving parts or active electronics, making them less prone to failure. Not affected by electromagnetic interference and other environmental factors that may affect production performance.
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Low cost
Passive optical components are usually cheaper than active optical components, which require power and complex circuits to operate.
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Low noise
Passive optical components do not produce electrical noise, making them well-suited for applications that require low-noise operations, such as long-distance fiber transmission and high-speed data networks.
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Low power consumption
Since passive optical components do not require external power supply, it has less consumption compared to active components.Perfect for applications that require low power consumption.
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Compact size
Passive optical components are usually small and light, making them easy to integrate into optical systems.
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types of Passive optical components
There are many kinds of passive optical components and various structures, which are generally classified according to the functions of the devices.
Optical fiber connector:
Devices with connection function in optical fiber optic communication lines.It is to realize the optical fiber cable and optical fiber and optical cable, optical fiber cable and active devices, optical fiber cable and other passive devices, optical fiber cable and system and instrument for the active connection of optical passive device connector.
Optical fibre coupler:
A device with a split circuit or coupling function in the optical fiber communication line.According to the form of port configuration, it can be divided into tree coupler and star coupler, which are generally composed of a single 1X2(Y type) coupler and 2X2(X type) coupler level, and used for various fiber networks, such as fiber cable TV, local area network (LAN), etc.
Wavelength division multiplexer :
Devices that can segment/demultiplexing wavelength in optical fiber communication lines. It can be divided into coarse wave division multiplexer (CWDM) and dense wave division multiplexer (DWDM), used for various wave division multiplexing systems, optical fiber amplifier, etc.
Optical Switch:
Devices with an optical path conversion function in an optical fiber communication line. According to the configuration of the port, it can be divided into multi-channel optical switch (1xN) and matrix optical switch (NxN), generally composed of a single 1X2 or 2X2 optical switch level, used for backup lines, test system and all-optical network.
Optical attenuator :
Devices that can reduce a part of the optical signal energy as required in optical fiber communication lines. According to the tun-ability of the attenuation amount, it can be divided into fixed attenuator and adjustable attenuator.
Optical isolator :
Devices that transmit only transmit optical signals in optical fiber communication lines.
Optical circulator:
Devices that allow the optical signal to be transmitted only along a fixed path.
Structural type of the passive optical components
The first type is an all fiber structure.
They only have optical fibers in the optical path and no other optical components. For example, fiber optic end face contact connectors use precision machined plug bodies (single core is generally ceramic, multi-core is generally polymer), the fiber optic is inserted and fixed, ground and polished, and then paired with peripheral components. Another example is the fused biconical coupler, which uses a micro torch to heat and stretch the two fiber coupling regions in parallel contact, forming a biconical structure, commonly known as the fused biconical method.
The second type is a combination structure of discrete components, also known as micro optical devices.
They are composed of optical fibers and various small optical components such as self focusing lenses, prisms, filters, etc. The basic optical path is a parallel optical path with beam expansion/focusing function composed of optical fibers and two 1/4 pitch self focusing lenses. Set up relevant micro optical components between two 1/4 pitch self focusing lenses according to functional requirements.
The third type is a planar waveguide structure, also known as photonic integrated devices.
The core optical path is made of various planar optical wave-guides using integrated optical technology according to functional requirements, some of which require electrodes to be deposited at certain positions, and then the optical waveguides are coupled with fibers or fiber arrays.
How to test passive optical components
The testing of passive optical components is a crucial step in ensuring their optical performance is accurate and meets expectations. The commonly used testing parameters and methods are as follows
Transmittance:
The transmittance test is used to measure the degree of light transmission of optical components. Common testing methods include using an optical power meter to measure the power difference between incident and transmitted light.
Reflectivity:
Reflectivity testing is used to measure the degree of reflection of optical components on incident light. A reflection spectrometer or optical power meter can be used to measure the power difference between incident and reflected light.
Polarization performance:
Polarization performance testing is used to evaluate the response of optical components to light of different polarization states. Polarization light sources and polarization analyzers can be used to measure the polarization properties of components, such as transmittance and extinction ratio.
Dispersion performance:
Dispersion performance testing is used to measure the refractive index changes of optical components to light of different wavelengths. Common methods include using spectrometers and interferometers to measure wavelength related information of light.
Deviation angle:
For certain optical components, such as prisms and splitters, the deviation angle is an important parameter. Angle measuring instruments or interferometers can be used to measure the deflection angle of components.
Surface quality:
Surface quality testing is used to evaluate the flatness and smoothness of the surface of optical components. Microscopes can be used to examine surface defects such as scratches, bubbles, and stains.
Thermal stability:
Thermal stability testing is used to evaluate the performance of optical components under temperature changes. The components can be placed in a thermostat and their optical performance changes can be measured at different temperatures.
Lifetime testing:
Lifetime testing is used to evaluate the service life and stability of optical components. Common methods include fatigue testing, temperature cycling testing, and wet heat testing.
PS: There may be targeted testing methods and parameters for different types of passive optical components. Therefore, before conducting testing, make sure to refer to relevant standards or manufacturer's testing guidelines to obtain more specific testing steps and requirements.
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