Multi-mode-single mode optical network full optical fiber interconnecting method and interconnector for realizing the same method

Abstract

A method for interconnecting all-optical fiber of multimode-singlemode optical network includes connecting normal multimode optical fiber with LPFG, preparing a core mould absorber with the same diameter as fiber core on LPFG long end surface fiber core at connector position for using it to block light transmission in multimode optical fiber to single-mode optical fiber core but not influencing light transmission in multimode optical fiber to single-mode optical fiber covering to from a band pass filter.

Description

technical field [0001] The invention belongs to the field of optical fiber passive devices and the technical field of micro-electromechanical systems (MEMS), and in particular relates to a multi-mode-single-mode optical network all-fiber interconnector. Background technique [0002] The local area network (LAN) market has developed rapidly in the past ten years, and the demand for short-distance computer high-speed interconnection has made the data rate of the LAN grow exponentially: from 10Mb / s to 1Gb / s to 10Gb / s, the laboratory of multimode optical fiber LAN in 2006 The data transmission rate has reached 1000Gb / s; it has become an inevitable trend that the optical fiber LAN replaces the traditional unshielded twisted pair LAN. However, due to the high cost, it is difficult to directly popularize and apply the wide area network and backbone network technology based on dense wavelength division multiplexing (DWDM) technology and single-mode optical fiber network in the local...

AI Technical Summary

Problems solved by technology

[0006] There are two main problems in the design of multi-mode-single-mode optical fiber network all-fiber interconnectors: one is the low coupling efficiency of single-mode and multi-mode optical fibers; Fiber Bandpass Filter

[0012] When used in the wavelength division multiplexing system of optical communication, this kind of fiber filter has several theoretical disadvantages: first, when used as a band-stop filter, the reflected light is too strong, which is easy to cause interference to the system, especially Affect the work of the laser in the optical communication line; secondly, when used as a bandpass filter, it must be used with a fiber coupler (or become a 2×2 beam splitter), and the light will enter and exit the fiber coupler twice and be split twice , the intensity is attenuated by 4 times (6dB), which greatly increases the requirements for the light intensity in the communication line, and increases the complexity of the system structure; finally, because the principle of FBG is the coupling of the forward propagation core mode and the back propagation core mode , the Bragg wavelength is only related to the refractive index of the fiber core and the period of the grating, so this fiber grating is very stable and not easily affected by the outside world, and it is difficult to tune the working wavelength when used as a filter

[0018] However, although LPFG has the above advantages, its transmission spectrum is still a band-stop type; its spectral characteristics are exactly opposite to the band-pass characteristics required in optical fiber communication wavelength division multiplexing, so it cannot be directly used in wavelength division multiplexing

In addition, the core of the multimode fiber is large, and the number of transmission modes is large, and the coupling effect of the core mode and the cladding mode is very complicated. It is impossible to make an LPFG filter with satisfactory performance on it. Therefore, bandpass is realized on the multimode fiber line. Filtering has become a difficult problem; and the problem of realizing bandpass filtering on multimode-single-mode optical fiber hybrid lines is even more difficult. This makes the full-fiber interconnection of multi-mode-single-mode optical networks concerned by academia and industry a common concern an impossible idea

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