The role of the DSP chip in an optical module
In coherent optical modules, the Digital Signal Processor (DSP) acts as the brain of the system, processing both incoming and outgoing signals to correct distortions, ensure data integrity, and overcome transmission impairments. For engineers, network architects, and procurement specialists navigating the complexities of modern optical networking, understanding the DSP's function is paramount to selecting the right high-speed optical transceiver solutions. It increases the robustness against transmission interferences and enables software control of the physical layer. In the evolving world of optical communications, two key modulation methods dominate the landscape: Intensity Modulation with Direct Detection (IM-DD) and Coherent Modulation. They allow modules to transmit and receive data at rates from 100G to 800G and beyond, supporting applications in data centers, cloud computing, AI clusters, and telecom networks.
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