Mode coupling light assembly

Abstract

The invention is applicable to the field of optical communication and provides a mode coupling light assembly. The assembly comprises a collimator array, an aspherical lens and a photoelectric detector, wherein the collimator array collimates an optical signal transmitted from each path of optical fiber into parallel light; and the aspherical lens converges the collimated parallel light to the photoelectric detector. The collimator array is needed to meet the requirement that the cross section of emergent beams is smaller than a clear aperture of the aspherical lens, and the converging angle is needed to accord with a numerical aperture of the photoelectric detector after the light is converged by the aspherical lens. In the embodiment of the invention, the mode coupling light assembly couples a plurality of paths of optical signals transmitted by fiber nodes to the photoelectric detector of an optical receiving assembly of optical cable terminal equipment in a low optical power penalty mode, additional loss brought by an optical coupler is avoided, and the optical power budget in an optical fiber transmission network is improved; therefore, the assembly contributes to improving the splitting ratio and increasing the transmission distance in a passive optical network.

Description

technical field [0001] The invention belongs to the field of optical communication, in particular to a mode coupling optical component. Background technique [0002] At present, the passive optical network (Passive Optical Network, PON) architecture used by FTTx is to transmit multi-routing optical nodes (Optical Network Unit, ONU) through the optical passive device-optical coupler (Coupler or PLC). The optical signal is coupled to an optical fiber for transmission, and then coupled to the optical cable terminal equipment (Optical Line Terminal, OLT), see figure 1 . [0003] The optical signal transmitted by the multi-routing ONU is coupled to one optical fiber through the optical passive device - the optical coupler. The optical power loss of the coupling is very serious, and the optical power loss of 4 channels is about 7dB, and the 8 channels are 1. The optical power of the path loss is about 10dB, and the relationship between the optical power loss PL and the number of...

AI Technical Summary

Problems solved by technology

The optical power of the laser used for optical signal transmission at the ONU end is limited, which is +2-+7dBm, and the sensitivity of the photodetector used for optical signal reception by the OLT is also limited, which is -36--28dBm. When the signal is transmitted for a certain distance in the optical fiber or divided into multiple signals, the optical signal will be weakened, that is, the optical power loss on the optical fiber link, especially the additional loss caused by the coupling of the optical coupler, will seriously limit the optical signal. Transmission distance or the number of ONUs that an OLT can divide

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