Modulation method suitable for optical signal and quantum key chip sending end device

The invention provides a modulation method suitable for an optical signal and a quantum key chip sending end device. The modulation method suitable for the optical signal comprises the following steps: representing the level states of two electric signals containing single-bit information by using binary digits; outputting an electric signal as a modulation electric signal according to the level state; and regulating and controlling a modulation component in the quantum key chip transmitting end device according to the modulation electric signal, and further modulating the degree of freedom of an optical signal applied to the modulation component so as to realize coding of single-bit information. 本公开提供了一种适用于光信号的调制方法及量子密钥芯片发送端装置。该适用于光信号的调制方法包括：利用二进制数字表示两个包含单比特信息的电信号的电平状态；根据电平状态输出电信号作为调制电信号；根据调制电信号调控量子密钥芯片发送端装置中的调制组件，进而对施加在调制组件上的光信号的自由度进行调制，以实现单比特信息的编码。