Optical burst-mode receiver

Abstract

Disclosed is a light bursting receiver, which comprises: photodiode, trans-impedance preamplifier, top and bottom detecting circuits, resistance-type potential divider and limiting amplifier. The invention is characterized in that it also comprises feed-forward reset impulse signal generation circuit, delay unit and gate circuit. Charging capacitor in the top detecting circuit can be variable capacitance; the feed-forward reset impulse signal generation circuit comprises limiting amplifier, an envelope pulse-generating circuit, and a reset pulse shaping circuit. The invention has the advantages of improving usage of signal channel, reducing error codes and of eliminating interference.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and particularly relates to a burst mode optical receiver for identifying and receiving optical digital signals of burst mode and optical digital signals of non-uniform code stream (inhomogeneity of amplitude and packet length). Background technique [0002] Optical fiber communication has developed in an all-round way and has penetrated into various application fields. People are focusing on the key technologies of the next generation optical fiber communication system and broadband optical fiber access network, so that the optical fiber network has both high-speed broadband trunk lines and fast and convenient broadband optical fiber access. to each user. Passive Optical Network (PON, Passive Optical Network) has the advantages of good business transparency, applicable to signals of any standard and rate, anti-electromagnetic interference and easy maintenance. It is a very promisin...

AI Technical Summary

Problems solved by technology

However, this feedback type reset pulse signal generation circuit has relatively large defects: first, the signal output by the limiting amplifier needs to be input to the envelope detector for envelope detection, so that the required preamble time and guard band time will be different. The second is that relative to the input signal of the entire receiver, the reset pulse signal generated by the feedback reset pulse signal generation circuit has a certain time delay, and the top detection circuit and the bottom detection circuit need to wait for the arrival of the reset pulse signal, thereby The time of the guard band is further increased, thereby reducing the channel utilization rate; the third is figure 2 The width of the reset pulse signal is not properly controlled, so that the overshoot during discharge is more serious, which increases the time of the preamble, thereby further reducing the channel utilization rate; the fourth is that the feedback reset pulse signal generation circuit introduces a feedback mechanism , making the receiving circuit less stable and prone to oscillation

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