Question

In Silicon nitride passive and active photonic integrated circuits: trends and prospects and one of discussed application of SiN is true delay line. But what is true delay line? Why is then a true distinction needed?

Answer 1

A true delay line in photonic integrated circuits provides a precise amount of time delay to optical signals, crucial for applications requiring accurate timing and synchronization such as high-speed communications.

Step-by-step explanation:

A true delay line in the context of Silicon nitride (SiN) passive and active photonic integrated circuits refers to a component that purposely delays an optical signal by a precise amount of time. Semiconductors like Silicon nitride allow for the integration of photonic devices, which can manipulate light signals, on an integrated circuit (IC). These circuits can have very small etched features down to the nanometer scale, allowing for precise control over light propagation and interaction.

Creating these photonic integrated circuits is extremely precise and leverages the semiconductor's ability to process information, due to the introduction of impurities which markedly alter its electronic properties. Applications for SiN-based integrated circuits include biomedical applications, high-speed electronic devices due to properties like resonant quantum tunneling, and the transmission of information via low-loss optical fibers in telecommunications.

The distinction of a 'true' delay line emphasizes the designed intent to provide an accurate delay, as opposed to incidental delays that may occur in a circuit. This is crucial in applications where timing and synchronization of signals are essential, such as in high-speed communication systems that rely on the precise manipulation of light signals.