Photonics involves generation, modulation, transmission and processing of light.

光电学涉及光的产生、调制、传输和处理。

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The digital transmission system Q factor-a new concept may be used to analyse the characteristics of digital transmission systems with different kinds of modulation.

数字传输系统的品质因数Q—这个新概念可以用于具有各种调制的数字传输系统性能的分析。

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Meanwhile, modulation schemes for deep space communication are provided based on channel features and requirements on data transmission rates.

同时，根据信道特点和数据传输速率的要求给出了深空通信的调制方式。

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Riding on cutting-edge technologies such as flex oDSP, super SD-FEC, and flex modulation format, this field trial achieved a record-breaking transmission distance of 1, 500 km using a super-channel PDM-16QAM-based high spectral efficiency solution, and a second record-breaking transmission distance of 3, 325 km using a super-channel Nyquist PDM-QPSK-based ultra-long-haul solution.

ENGADGET: Huawei tests 2Tbps data transmission over Vodafone's German network, calls it a 'first'