阅读说明：本技术 一种光模块 (Optical module ) 是由 张玉娜 石良 于 2019-04-24 设计创作，主要内容包括：本说明书提供一种光模块,包括有金手指引脚以及与金手指引脚连接的解复用电路,所述解复用电路接收所述金手指引脚上的三态信号,并将所述三态信号解复用,转换得到都是两态的速率选择信号以及复位信号,其中,所述速率选择信号用于对所述光模块中的限幅放大器进行带宽控制,所述复位信号用于对所述光模块中的交流耦合电路进行放电复位。可知,上述手段实现对金手指引脚的复用,在无需增加金手指引脚的前提下,通过一个金手指引脚传输一个三态信号,再通过与光模块内的解复用电路配合,实现2个功能信号通过一个金手指引脚同时传输给光模块。如此,节约了光模块的金手指引脚,可进一步支持光模块的多功能模式,进而提高光模块的整机性能。(The present specification provides an optical module, including a gold finger pin and a demultiplexing circuit connected to the gold finger pin, where the demultiplexing circuit receives a tri-state signal on the gold finger pin, demultiplexes the tri-state signal, and converts the tri-state signal to obtain a rate selection signal and a reset signal, where the rate selection signal is used to perform bandwidth control on a limiting amplifier in the optical module, and the reset signal is used to perform discharge reset on an ac coupling circuit in the optical module. Therefore, the multiplexing of the gold finger pins is realized by the above means, and on the premise that the gold finger pins are not required to be added, a tri-state signal is transmitted through one gold finger pin, and then the 2 functional signals are simultaneously transmitted to the optical module through one gold finger pin by matching with a demultiplexing circuit in the optical module. Therefore, golden finger pins of the optical module are saved, the multifunctional mode of the optical module can be further supported, and the overall performance of the optical module is improved.)

1. An optical module, comprising a gold finger pin and a demultiplexing circuit connected to the gold finger pin, wherein the demultiplexing circuit receives a tri-state signal on the gold finger pin, converts the tri-state signal into a first two-state signal and a second two-state signal, and the demultiplexing circuit includes:

a first comparing unit, a first input end of which receives the tri-state signal, a second input end of which is configured with a first reference voltage, and the first comparing unit controls to output a comparison signal according to the magnitude relation between the level of the tri-state signal and the first reference voltage;

a second comparing unit, a first input end of which is configured with a second reference voltage, a second input end of which receives the tri-state signal, and the second comparing unit controls to output the second two-state signal according to the magnitude relation between the level of the tri-state signal and the second reference voltage;

And the clock signal end of the trigger inputs the second two-state signal, the data input end of the trigger inputs the comparison signal, when the rising edge of the second two-state signal arrives, the level of the output end of the trigger is latched as the level of the current comparison signal, and the output end of the trigger outputs the first two-state signal.

2. An optical module according to claim 1, wherein the tri-state signal has a high level, a medium level and a low level, specifically: when the voltage is larger than the second reference voltage, the level of the tri-state signal is high level; when between the first reference voltage and the second reference voltage, the level of the tri-state signal is an intermediate level; when the voltage level of the tri-state signal is lower than the first reference voltage, the level of the tri-state signal is low level, wherein the second reference voltage is higher than the first reference voltage.

3. An optical module as claimed in claim 1 or 2, characterized in that the first two-state signal is a rate selection signal for bandwidth control of a limiting amplifier in the optical module; the second two-state signal is a reset signal for performing discharge reset on an alternating current coupling circuit in the optical module.

4. An optical module according to claim 3, wherein the first input terminal and the second input terminal of the first comparing unit are respectively an inverting input terminal and a non-inverting input terminal of the corresponding comparator, when the tri-state signal is at a low level, the comparing signal at a high level is output, and if a rising edge of the reset signal arrives, the flip-flop latches and outputs the high level of the comparing signal, and outputs the rate selecting signal at a high level; when the tri-state signal is at a middle level or a high level, the level of the output comparison signal is low, if the rising edge of the reset signal arrives, the flip-flop latches and outputs the low level of the comparison signal, and the rate selection signal of the low level is output;

the first input end and the second input end of the second comparison unit are respectively an inverting input end and a non-inverting input end of the corresponding comparator, when the level of the tri-state signal is greater than the second reference voltage, the level of the output reset signal is high, otherwise, the level of the output reset signal is low.

5. The optical module according to claim 4, wherein when the rate selection signal is at a high level, the control unit switches the bandwidth supported by the limiting amplifier to a high-rate bandwidth, and otherwise, switches the bandwidth supported by the limiting amplifier to a low-rate bandwidth; and when the reset signal is at a high level, performing discharge reset on the alternating current coupling circuit, otherwise, not performing discharge reset on the alternating current coupling circuit.

6. An optical module as claimed in claim 5, wherein said high rate bandwidth is 10G bandwidth and said low rate bandwidth is 2.5G bandwidth.

7. An optical module according to claim 1, wherein the flip-flop is an edge-triggered D flip-flop, a synchronization input terminal of the D flip-flop inputs the comparison signal, and a clock signal terminal of the D flip-flop inputs the reset signal.

8. The optical module as claimed in claim 7, wherein the D flip-flop is a TTL edge D flip-flop.