Wavelength Division Multiplexing

Technical Implementation Approaches for Semiconductor Tunable Lasers

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Technical Implementation Approaches for Semiconductor Tunable Lasers

Abbreviations Used in This Article (1) DFB：Distributed Feedback Laser(分布式反馈激光器)。It provides feedback through an integrated Bragg grating (a periodically modulated refractive index structure), achieving single longitudinal mode laser output with narrow linewidth and high wavelength stability, widely used in optical communication and sensing fields. (2) DBR：Distributed Bragg Reflector Laser(分布式布拉格反射器激光器)。Similar to DFB but with a different structure, … Read more

Why Most Communication Buses Are Similar in Embedded Development?

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Why Most Communication Buses Are Similar in Embedded Development?

In embedded development, you must have encountered various buses, including address and data buses within the chip, high-speed and low-speed buses, as well as various communication buses outside the chip. However, it seems that people still do not have a good grasp of buses, so today I have selected an article about buses for everyone … Read more

100G SWDM4 Protocol and WBMMF Wideband Multimode Fiber

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100G SWDM4 Protocol and WBMMF Wideband Multimode Fiber

There has been a lot of discussion about 100G recently. This year, a new alliance called the SWDM Alliance was established, which utilizes WBMMF fiber, and the WBMMF standard will be released next month. Today, let’s discuss what this is about. The alliance includes many manufacturers, including Commscope (promoting WBMMF), Corning, Panduit, OFS, Prysmian fiber … Read more

Understanding CE, C++, and C+L Bands in Fiber Optics

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Understanding CE, C++, and C+L Bands in Fiber Optics

A few days ago, while writing an article on optical communication, I mentioned the CE, C++, and C+L bands. Many students asked, previously they only knew about the O band, E band, C band, and L band, and had never heard of CE, C++, and C+L bands. What do these mean? Today, I’ll specifically explain … Read more