Coherent DSP (Digital Signal Processor)
A coherent DSP (Digital Signal Processor) plays a crucial role in modern optical communication systems, especially those using coherent detection techniques. Coherent detection involves using both the amplitude and phase information of the received optical signal to extract transmitted data. A coherent DSP processes the received optical signal in the digital domain to recover the transmitted data accurately. Here's how a coherent DSP works: Photodetection and Mixing: In coherent optical communication, the received optical signal is mixed with a local oscillator (LO) signal to generate an electrical signal. This process is known as photodetection. The LO signal is typically generated at the receiver and has a stable frequency and phase relationship with the transmitted signal. Analog-to-Digital Conversion (ADC): The electrical signal generated by photodetection is analog in nature. The first step in coherent DSP processing is to convert this analog signal into a digital format u