First, let’s understand how optical fibers transmit signals. The structure diagram of fiber generally consists the core, cladding, and coating. The fiber core and cladding are made of glasses with different refractive indices. The core is where light travels, which made of high refractive index silica glass and is the only part of the cable that includes a rare-earth element. The cladding is the material that surrounds the core, which made of lower refractive index silica glass. When light hits the cladding, it bounces back into the core. Light is injected into the fiber at a specific incident angle, and total internal reflection then takes place at the boundary between the core and the cladding because the cladding has a lower refractive index than the core. Without the cladding, light would go in all directions and exit the core. But thanks to the cladding’s refractive index, light remains in the core and continues its path.
There are many types of WDM(wavelength division multiplexing) technologies known at present, such as FBT (Fused Biconical Taper), FBG (Fiber Bragg Grating), TFF (Thin Film Filter), AWG (Arrayed Waveguide Grating), EDG (Etched Diffraction Grating), MZI (Mach-Zehnder Interferometers), and MRR (Micro Ring Resonator). Among them, TFF and AWG are the two most commonly used WDM technologies. This article will introduce the structure and working principle of TFF WDM devices.
The structure of a three-port WDM device includes a dual-fiber collimator, a single-fiber collimator, and a TFF filter.
What is optical splitter Optical fiber splitter is to split an optical fiber signal into two or more optical signal outputs by a determined ratio, which is an important device in access FTTH networks. For example, a 1×4 optical splitter distributes the optical signal in one optical fiber to four optical fibers in a certain proportion. Unlike the WDM (wavelength division multiplexer), the demultiplexer divides the optical signals of different wavelengths into corresponding wavelength channels, while the optical splitter divides the entire optical signal into multiple channels for transmission.
Overview: What does optical add-drop multiplexer stand for Functions of OADM Types of OADM (FOADM, TOADM) Applications of OADM
1,What does optical add-drop multiplexer stand for OADM is Optical Add-Drop Multiplexer, which used in WDM systems for multiplexing and routing different channels of light into or out of a single mode fiber. Its main function is to selectively drop or add one or multiple wavelength channels without affecting the transmission of other wavelength channels. The OADM device is one of the key devices of the all-optical network.
As technology continues to advance, the demand for more data and faster speeds increases. One way to meet these demands is by using Wavelength Division Multiplexing (WDM) technology, which allows for the expansion of a network’s capacity by increasing the amount of data that can be transmitted over a single fiber optic cable. In this article, we’ll explore how WDM works and the benefits it can bring to your network.
Overview: Expanding fiber capacity with WDM What’s Mux and Demux CWDM vs DWDM What does optical add-drop multiplexer stand for WDM bands WDM technology: TFF and AWG WDM-PON in access network WDM in 5G network
Wavelength Division Multiplexing (WDM) is one of the most common ways of using wavelengths to increase bandwidth by multiplexing various optical carrier signals onto a single optical fiber. It combines a series of optical carrier signals with different wavelengths carrying various information and coupled to the same optical fiber for transmission at the transmitting end. At the receiving end, optical signals of various wavelengths are separated by a demultiplexer. This technique of simultaneously transmitting two or many different wavelengths in the same fiber is called wavelength division multiplexing, or WDM.
In order to meet the needs of EDFA (Erbium-Doped Fiber Amplifier) applications, HYC has recently launched hybrid series product for the miniaturized EDFA. The product line includes 980/1550nm IWDM Hybrid (Isolator+WDM), GFF (Gain Flattening Filter), IGFF (Isolator + GFF), etc..
With the growth of global data volume, parallel optical technology is an important technical for the expansion of current data centers, and the optical transmission rate has continuously evolved from 10Gbps, 40Gbps, 100Gbps to 200Gbps, 400Gbps, and even 600Gbps, 800Gbps. At this year’s OFC conference, a number of Chinese suppliers have successively demonstrated 800G rate optical modules, which means that 800G will enter a new era.
What is parallel optics? Parallel optical technology is a special optical communication technology that transmits and receives signals at both ends of the link. Parallel optical transceiver modules are usually used to achieve high-speed signal transmission at both ends. Parallel optical technology is a cost-effective solution for 4×50G, 8×50Gbps transmission.
If you have ever been to data center, then you must have a deep understanding of the following cabling scenarios.
data center
If an optical circuit can improve such a cabling environment, are you interested?
Optical circuit
The optical fiber flex circuit is independently developed by HYC, which provides a solution of efficient routing, high-core number connection, and complete customization. It can be widely used in applications , including multi-core fiber cross transmission, switch equipment, optical backplane interconnection, card-to-card connection, rack-to-rack connection, wavelength selection switch, and high-density fiber management.
A single customized optical fiber flex circuit can replaces the complex bundled jumper connections, which can significantly save equipment space, improve the smoothness of airflow between equipment, and improve the working environment of sensitive components.
The optical circuit can realize the output/input of any connector, as well as direct connection or fusion of the connector; support single-mode/multi-mode and single-core/multi-core fiber. As long as it is designed in advance, it can theoretically support the connection of any number of cores and any polarity link.
Optical circuit
HYC’s optical fiber lines use environmentally friendly materials that meet the application of industrial environments, and perform insertion loss, return loss and polarity tests before leaving the factory to ensure that each product can meet the optical characteristic requirements and link polarity requirements designed by the customer. Some forms of products adopt high-efficiency fully automatic production machines, which not only improve production efficiency, but also make the products more compact and beautiful. Machine production can ensure that the direction of each line is accurate and the polarity is correct.
At present, HYC can provide three types of optical circuit, and customers can choose according to the applications, core number, environment, space and other requirements.
Optical Passive Components 