时域测量 除了频域测量以外,还经常需要对采用数字传输方式的光通信系统进行时域测量,通过时域测量来确保整个系统的数据传输质量。时域测量有单值波形法和多值波形法两种。单值波形测量包括脉冲参数、模板和统计测量,如均方根值噪声和均方根值抖动等。多值波形测量常称为眼图,包括脉冲参数、框架、消光比和抖动等。 脉冲参数测量包括有:上升时间、下降时间、过冲、下冲、前冲、脉冲宽度、占空因数、周期和建立时间等。要想精确地测量脉冲参数,光时域测量系统的脉冲响 Time Domain Measurement In addition to frequency domain measurements, it is often necessary to make time-domain measurements of optical communication systems that use digital transmission and to ensure the quality of data transmission throughout the system through time-domain measurements. There are two kinds of single-value waveform method and multi-value waveform method in time domain measurement. Single-valued waveform measurements include pulse parameters, templates, and statistical measurements such as rms noise and rms jitter. Multivariate waveform measurements are often called eye diagrams and include pulse parameters, frame, extinction ratio, and jitter. Pulse parameters measured include: rise time, fall time, overshoot, undershoot, impulse, pulse width, duty cycle, cycle and set-up time. To accurately measure the pulse parameters, measure the impulse of the system in optical time domain