Active optical cable optical coupling device with high coupling efficiency

Abstract

The invention discloses an active optical cable optical coupling device with high coupling efficiency. The active optical cable optical coupling device with the high coupling efficiency comprises a laser and an optical fiber, wherein a micro lens is installed between the laser and the coupling end of the optical fiber; the end surface of the coupling end of the optical fiber is a tapered plane; an included angle between the end surface of the coupling end of the optical fiber and the light emitting center line of the laser is 40-50 degrees; the end surface of the coupling end of the optical fiber is provided with a total reflection film; and the center of the end surface of the coupling end of the optical fiber and the center of the micro lens are positioned or almost positioned on the light emitting center line of the laser. According to the active optical cable optical coupling device with the high coupling efficiency, which is disclosed by the invention, the end surface of the coupling end of the optical fiber, which is in the tapered plane shape, is used, and the total reflection film is arranged, so that the active optical cable optical coupling device has a total reflection function to replace the reflection function of a prism in the traditional active optical cable optical coupling device. During engineering coupling, only the optical fiber or an optical fiber array needs to be coupled in two directions, the coupling difficulty is lowered, and the coupling efficiency is improved. The coupling efficiency can be 87.13% which is obviously higher than the coupling efficiency of the traditional active optical cable optical coupling device, which is below 80%, and the size of the whole device is reduced.

Description

technical field [0001] The invention relates to an active optical cable optical coupling device, in particular to a high-coupling-efficiency optical coupling device especially suitable for 40G active optical cables. Background technique [0002] With the rapid development of the broadband industry, the relay distance of laser communication is getting longer and the communication rate is getting higher and higher, and the coupling efficiency has become one of its performance bottlenecks. In particular, the coupling efficiency of active optical cables at high speeds is difficult to guarantee. Optical signal-to-noise ratio (OSNR), dispersion, nonlinear effects, and coupling welding of internal components of active optical cables all restrict the coupling efficiency. [0003] The current active optical cable has a low coupling efficiency between the fiber and the laser. The reason is that the design of the optical coupling device is not ideal. For example, the optical coupling d...

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Problems solved by technology

In particular, the coupling efficiency of active optical cables at high speeds is difficult to guarantee. Optical signal-to-noise ratio (OSNR), dispersion, nonlinear effects, and coupling welding of internal components of active optical cables all restrict the coupling efficiency.

[0003] The current active optical cable has a low coupling efficiency between the fiber and the laser. The reason is that the design of the optical coupling device is not ideal. For example, the optical coupling device of the current 40G active optical cable is mostly VCSEL, that is, vertical cavity surface emission. The combination of laser and prism, the specific structure is as follows figure 1 As shown, the light emitted by the laser 1 passes through the 45° prism 2, and after the optical path changes by 90°, it is coupled with the optical fiber 5, figure 1 V-groove 3 and fiber entry 4 are also shown in

This structure has the following defects: the signal sent by the laser passes through the prism to rotate the optical path by 90° and enters the optical fiber. When coupling the optical signal, the optical fiber array needs to be moved in four directions. It is difficult to find the best coupling position in a short time, so It will waste debugging time and labor costs, and the coupling efficiency is lower than 80%

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