Patent ID: 9628192
Date: 2017-04-18
CPC Classifications: H01S,H04B

Claim:
1. An optical transmitter, comprising: a transmitter optical (TO) base, a thermoelectric cooler (TEC), and a heat sink that are transverse and are connected sequentially from bottom to top; a second monitor photodiode detector (MPD), a 10 G-directly modulated laser (G-DML), a collimation lens, and a narrowband optical filter that are disposed above the heat sink, wherein the second MPD and the collimation lens are located at two sides of the 10 G-DML, and the narrowband optical filter is located at one side of the collimation lens, and one surface, which faces the collimation lens, of the narrowband optical filter is connected to the heat sink at a preset tilt angle; a first MPD disposed above the narrowband optical filter; a wavelength locking monitoring circuit connected to a TO pin disposed at one side of the TO base, and a wavelength locking control circuit connected to the wavelength locking monitoring circuit; wherein a forward emitted light emitted by the 10 G-DML is input to the narrowband optical filter through the collimation lens, and the narrowband optical filter splits the forward emitted light into a forward transmitted light and a backward reflected light, transmits, at a preset elevation angle, the backward reflected light to the second MPD, and partially reflects the forward transmitted light to the first MPD connected to the narrowband optical filter; wherein the first MPD is configured to receive and monitor a first optical power of the forward transmitted light, and the second MPD is configured to receive and monitor a second optical power that is after the backward emitted light and the backward reflected light complement each other; and wherein the wavelength locking monitoring circuit is configured to receive the first optical power and the second optical power by using the TO pin, separately compare detected variations of the first optical power and the second optical power and a variation of a wavelength locking factor K0 with corresponding thresholds, and send a comparison result to the wavelength locking control circuit, to enable the wavelength locking control circuit to adjust, according to the comparison result and by using the TO pin, a temperature of the TEC to perform wavelength alignment, wherein the wavelength locking factor K0 is a ratio of the first optical power to the second optical power or a difference between the first optical power and the second optical power.