Control the raising of the laser drive current to improve the quality of eye chart

An optical transceiver module comprising: an optical transmitter arrangement including a laser unit which can produce an optical signal in response to an electrical laser current; an optical receiver arrangement; and a printed circuit board on which is arranged: a controller capable of generating digital control signals; a laser driver that can generate the electrical laser current for use by the laser unit, a means for digitally transmitting the digital control signals from the controller to the laser driver, at least one digital-to-analog converter in communication with the means for digital transmission, wherein the at least one digital-to-analog converter is configured to convert the light emitted by the control of digital control signals into analog control signals; and a means for varying the magnitude of the electrical laser current in response to the analog control signals.