JPH0521463U - 2 wave combined light module - Google Patents

Abstract

(57) [Summary] [Object] To provide a two-wave multiplexing optical module with a small coupling loss by adopting an angle adjusting mechanism in the polarization beam splitter 4. [Structure] The light of the semiconductor laser 1 is collimated by a collimator lens 1a.
By the collimator lens 1b into parallel light 11, the parallel light 11 and the parallel light 12 are combined by the polarization beam splitter 4 into combined light 13 on the same optical axis, and the polarization beam splitter 4 is placed on a horizontal plane. The horizontal rotary table 21 is rotated, and the horizontal rotary table 21 is mounted on the vertical rotary table 22 which is rotated in a vertical plane, and the angle of the polarization beam splitter 4 is adjusted with respect to the optical axis of the combined light 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-wave combined light module in which the light of two semiconductor lasers is made into parallel light, this parallel light is made into combined light by a polarization beam splitter, and this combined light is coupled to an optical fiber.

[0002]

[Prior Art]

 Next, the configuration of a two-wave multiplexing optical module according to the conventional technique will be described with reference to FIG. In FIG. 2, 6 and 7 are light emitting modules, and 8a and 8b are polarization-maintaining fibers. In FIG. 2, the light emitted from the polarization-maintaining fiber 8a is converted into the parallel light 11 by the lens 5a, the light emitted from the polarization-maintaining fiber 8b is converted into the parallel light 12 by the lens 5b, and the parallel light 11 and the parallel light 12 are polarized beams. The light is multiplexed by the splitter 4, and the multiplexed light 13 is coupled to the optical fiber 3.

[0003]

[Problems to be solved by the device]

 FIG. 2 shows an optical module using polarization-maintaining fibers 8a and 8b, which combine the lights emitted from the polarization-preserving fibers 8a and 8b. However, in FIG. 2, the light from the semiconductor laser is coupled to the polarization-maintaining fibers 8a and 8b, and the light from the polarization-maintaining fibers 8a and 8b is coupled to the optical fiber 3, so that the total coupling loss is reduced. Increase. Moreover, since two optical modules 6 and 7 are connected, the number of parts and the shape are increased. Furthermore, assembling of the optical module involves adjustment of the polarization-maintaining fibers 8a and 8b, and since there are many parts for aligning the optical axes, the adjustment takes time.

According to this invention, after the emitted light from the semiconductor laser is made into parallel light by a lens, the two parallel lights are directly combined by a polarization beam splitter 4 adopting an angle adjusting mechanism, so that the coupling loss is reduced. It is an object of the present invention to provide a two-wave multiplexing optical module that is reduced in number.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, in the present invention, the light of the semiconductor laser 1 is made into the parallel light 11 by the collimating lens 1a, and the light of the semiconductor laser 2 is made into the parallel light 12 by the collimating lens 1b. Is converted into the combined light 13 on the same optical axis by the polarization beam splitter 4, and the polarization beam splitter 4 is mounted on the two-wave combination optical module that combines the combined light 13 with the optical fiber. The polarization beam splitter 4 is rotated in the horizontal plane. A table 21 and a vertical table 22 on which the horizontal table 21 is placed and which rotates the horizontal table 21 in a vertical plane are provided, and the angle of the polarization beam splitter 4 with respect to the optical axis of the combined light 13 is adjusted.

[0006]

[Action]

 Next, the configuration of the two-wave multiplexing optical module according to the present invention will be described with reference to FIG. In FIG. 1, 1 and 2 are semiconductor lasers, 3 is an optical fiber, 4 is a polarization beam splitter, 5a, 5b and 5c are lenses, 21 is a horizontal rotary base, and 22 is a vertical rotary base.

Light emitted from the semiconductor laser 1 is converted into parallel light 11 by a lens 5 a, transmitted through a polarization beam splitter 4, and coupled to an optical fiber 3. The light emitted from the semiconductor laser 2 is converted into parallel light 12 by the lens 5b, reflected by the polarization beam splitter 4 and coupled to the optical fiber 3.

The polarization beam splitter 4 is placed on a horizontal turntable 21 that rotates in the horizontal direction, and the horizontal turntable 21 is placed on a vertical turntable 22 that rotates in the vertical direction. For the parallel light in the reflection direction, that is, the parallel light reflected by the polarization beam splitter 4, the emission direction can be freely adjusted by rotating the polarization beam splitter 4. At this time, the parallel light in the transmission direction hardly shifts its optical axis even if the rotation angle of the polarization beam splitter 4 is changed. The horizontal rotary table 21 and the vertical rotary table 22 shown in FIG. 1 constitute an angle adjusting mechanism.

The angle adjusting mechanism of FIG. 1 makes it possible to easily match the optical axes of the parallel light in the transmission direction and the parallel light in the reflection direction. Further, the coupling efficiency is improved by about 1 dB as compared with the conventional technique because the light of the semiconductor laser is directly coupled to the optical fiber.

[0010]

[Effect of the device]

 According to this invention, since the emitted light from the semiconductor laser is collimated by the lens and then the two collimated light are directly combined by the polarization beam splitter and coupled to the optical fiber, the coupling loss is small. . Moreover, since the shape can be made small, the mounting space is small and the handling is easy. Furthermore, since the structure is simple, the optical axis alignment becomes easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a two-wave multiplexing optical module according to the present invention.

FIG. 2 is a configuration diagram of a two-wave multiplexing optical module according to a conventional technique.

[Explanation of symbols]

 1.2 light emitting element 3 optical fiber 4 polarizing beam splitter 5a to 5c lens 6.7 light emitting module 8a to 8b polarization preserving fiber 11/12 parallel light 13 combined light 21 horizontal rotary table 22 vertical rotary table

Claims (1)

[Scope of utility model registration request] 1. The light of the first semiconductor laser (1) is supplied to the first L
The D collimator lens (5a) makes the first parallel light (11), and the light from the second semiconductor laser (2) becomes the second parallel light (12) by the second LD collimator lens (5b). The parallel beam (11) and the second parallel beam (12) of the polarization beam splitter
In the two-wave multiplexing optical module that makes the combined light (13) on the same optical axis at (4) and couples the combined light (13) to the optical fiber (3), install the polarization beam splitter (4), 4) is equipped with a horizontal turntable (21) that rotates the horizontal plane (21) and a vertical turntable (22) that mounts the horizontal turntable (21) and rotates the horizontal turntable (21) in a vertical plane. ) The optical module characterized by adjusting the angle of the polarization beam splitter (4) with respect to the optical axis.