Patent ID: 9653878
Date: 2017-05-16
CPC Classifications: H01S,H04B

Claim:
1. An optical transmitter, comprising: a laser driver; a transmitter optical subassembly (TOSA), comprising a laser connected to the laser driver, and a monitoring photodiode (MPD) receiving light from said laser and providing a feedback current to said laser driver, wherein said laser driver and said laser operate in a first mode and a second mode; a current divider comprising a resistor connected to said MPD and a switch between the resistor and ground, wherein the current divider is configured to reduce said feedback current from said MPD when said laser operates in said first mode; an analog-to-digital converter (ADC) configured to convert the feedback current, a mirrored feedback current, or a reduced feedback current to a digital signal, wherein the mirrored feedback current and the reduced feedback current are produced or generated from the feedback current; a microprocessor configured to receive the digital signal, turn on said switch in the first mode and turn off said switch in the second mode; wherein said laser driver is configured to determine the output power of said laser from said feedback current reduced by said current divider in the first mode, and directly from said feedback current in the second mode.