Optical module
View Patent ↗The present application provides an optical module, including a laser, a laser driving chip, and a lens component disposed above the laser and the laser driving chip, where an inner cavity wall of the lens component that faces towards the laser and the laser driving chip is provided with a transmitting lens; a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film; and there is no reflective film coated on a part or entire of a region, of the inner cavity wall of the lens unit, which is irradiated by a secondarily reflected laser light.
1. An optical module, comprising:
a laser and a laser driving chip that are disposed on a circuit board, and
a lens component disposed above the laser and the laser driving chip, wherein
the lens component is provided with a transmitting lens for collimating and converging laser light emitted by the laser on an inner cavity wall of the lens component that faces towards the laser and the laser driving chip, and a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film;
the laser driving chip is provided with a clock data recovery circuit in a non-edge region thereof, and
the optical module is configured to reflect, by the reflective film on the surface of the transmitting lens, a part of the laser light emitted by the laser, and reflect secondarily, by an edge region of the laser driving chip, the laser light reflected by the reflective film to be irradiated onto the inner cavity wall of the lens unit, wherein there is no reflective film coated on a part or entire of a region, of the inner cavity wall of the lens unit, which is irradiated by the secondarily reflected laser light,
wherein a region of the laser driving chip where the clock data recovery circuit is located is coated with a high-reflectivity film.
2. The optical module according to claim 1 , wherein a distance between a boundary, of the reflective film on a side closer to the laser driving chip, and a center of the transmitting lens is 0.5˜2.5 mm.
3. The optical module according to claim 1 , wherein the clock data recovery circuit is disposed in a central region of the laser driving chip.
4. The optical module according to claim 1 , wherein a distance between the laser driving chip and a center of the laser is greater than or equal to f (R, f 1 ,θ)
f
(
R
,
f
1
,
θ
)
=
f
1
sin
2
θ
2
cos
(
2
θ
2
-
θ
)
cos
θ
,
θ
2
=
θ
+
arctan
f
1
tan
θ
R
,
wherein R indicates a curvature radius of the transmitting lens, f 1 indicates a distance between the surface of the transmitting lens and a light-emitting cavity surface of the laser, and θ indicates a maximum divergence angle of the laser.
5. An optical module, comprising:
a laser and a laser driving chip that are disposed on a circuit board, and
a lens component disposed above the laser and the laser driving chip, wherein
the lens component is provided with a transmitting lens for collimating and converging laser light emitted by the laser on an inner cavity wall of the lens component that faces towards the laser and the laser driving chip, and a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film;
the laser driving chip is provided with a clock data recovery circuit in a non-edge region thereof, and
the optical module is configured to reflect, by the reflective film on the surface of the transmitting lens, a part of the laser light emitted by the laser, and reflect secondarily, by an edge region of the laser driving chip, the laser light reflected by the reflective film to be irradiated onto the inner cavity wall of the lens unit; and
a distance between a boundary of the reflective film on a side closer to the laser driving chip and a center of the transmitting lens is less than f (R, f 1 ,θ),
wherein
f
(
h
1
,
R
,
f
1
,
θ
)
=
h
1
*
sin
(
2
θ
2
-
θ
)
cos
θ
+
f
1
sin
2
θ
2
cos
(
2
θ
2
-
θ
)
cos
θ
,
θ
2
=
θ
+
arctan
f
1
tan
θ
R
,
h 1 indicates a distance between the inner cavity wall of the lens component and an upper surface of the laser driving chip, R indicates a curvature radius of the transmitting lens, f 1 indicates a distance between the surface of the transmitting lens and a light-emitting cavity surface of the laser, and θ indicates a maximum divergence angle of the laser,
wherein a region of the laser driving chip where the clock data recovery circuit is located is coated with a high-reflectivity film.
6. The optical module according to claim 5 , wherein the clock data recovery circuit is disposed in a central region of the laser driving chip.