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激光调制需要偏置电流(bias current),查阅TI 的一些laser diode driver IC 的技术手册(例如ONET1151L)并没有看到关于如何设定偏置电流的介绍,推测是用VCC加电阻调节偏置电流,想请问一下这里的VCC可调么?或者有没有哪位大神可以解释一下此类激光驱动芯片设置偏置电流的原理,拜谢。