Semiconductor Optical Amplifiers for Optical Communication Systems

Abstract

The invention relates to a semiconductor amplifier used for an optical communication system. The semiconductor amplifier is characterized in that an active layer is of a double-active layer structure comprising a first active layer and a second active layer. Profitably, the first active layer is a quantum well layer and the second active layer is a quantum dot layer. According to the invention, 3dB gain bandwidth of the semiconductor amplifier can reach at least 100nm bandwidth, so new design requirements of a time and wavelength division multiplexing passive optical network (TWDM-PON) and a wave division multiplexing passive optical network (WDM-PON). Thus, reuse of the semiconductor amplification of up-and-down signals is achieved, thereby reducing numbers of optical amplifiers and reducing framework cost of the optical amplifiers even the whole passive light network. In addition, power damage caused by a large number of optical amplifiers is reduced, and noise caused by the optical amplifiers is reduced, so signal transmission performance of the whole system is improved.

Description

technical field [0001] The present invention relates to optical communication technology, in particular to a semiconductor optical amplifier used in the optical communication system used in the communication system. Background technique [0002] FSAN and ITU-T have recently announced that the next generation passive optical network NGPON2 should be able to achieve a passive reachable range of more than 40km and its power budget should not be less than 29dB and support a splitting ratio of at least 1:64. Therefore, there is a continuing need for signal amplification of uplink and downlink signals. The wavelength range of the future TWDM-PON is that the upstream wavelength window is in the C-band (1524-1544nm) and the downstream signal wavelength range is in the L+ band (1596-1603nm). On the other hand, wavelength division multiplexed passive optical network (WDM-PON) adopts the full spectrum range including C and L bands, that is, the full band from 1524nm to 1625nm. [000...

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Problems solved by technology

As can be seen from the figure, according to the document "R.Bonk, et al,"Long Reach Passive Optical Network Architectures."In Proceedings of Photonic Networks:15.ITG Symposium,pp.1-5.VDE,2014 "It can be seen that in figure 1 In the structure (b), 2(x-1) semiconductor optical amplifiers are needed, on the one hand, the increase of its quantity brings unfavorable cost and additional energy consumption, and because each SOA semiconductor optical amplifier can only handle Uplink light or downlink light, so the grating must be introduced to separate the uplink and downlink light in the amplification stage, and after processing, it must be mixed through the grating, which introduces additional noise and reduces the transmission performance.

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