A low-rate dual-transmission sfp optical module

Abstract

The invention discloses a low-rate double-emission SFP optical module. A light source driver is connected to a light source and is used for driving the light source to emit light according to a light source driving current. A light power detection unit is connected to a power control unit, the light source and a micro-control unit and is used for detecting emergent light power of the light source and feeding the emergent light power back to the power control unit. The power control unit is connected to the light source driver and the light power detection unit and is used for controlling the driving current sent to the light source by the light source driver according to feedback information sent by the optical power detection unit so as to adjust light emission power. The micro-control unit is used for monitoring a work temperature and a work voltage of a light emitting module. The light power control unit carries out low-frequency cutoff on a frequency lower than a frequency of a transmission signal. In the invention, by using the low-rate double-emission SFP optical module, the light power control unit carries out low-frequency cutoff on the frequency lower than the frequency of the transmission signal so that reliable data transmission can be guaranteed when a data rate is at tens of Kb / s to tens of Mb / s.

Description

technical field [0001] The invention relates to the field of optical modules, in particular to a low-rate dual-transmission SFP optical module. Background technique [0002] In many applications of optical communication, extremely high data transmission rates are required to achieve efficient data transmission requirements, but in some special applications, the data rates that need to be transmitted are only tens of Kb / s to tens of Mb / s, But it has very high requirements on the reliability of the transmitted data. For example, the IEEE C37.94 standard for signal transmission in power systems defines a rate of 2.048Mb / s, and the lowest can reach 64kb / s. However, in the face of such low-speed and high-reliability transmission requirements, conventional SFPs cannot perform reliable transmission, and some low-frequency information may be lost. [0003] Among the existing schemes, there are some schemes that use high-speed SFP modules to be backward compatible to low-speed. The...

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Problems solved by technology

[0004] However, this backward compatible SFP module has the following defects: 1. Generally, the signal type of the low-rate signal is single-ended TTL, and the chip at the transmitting end cannot work at a high speed, and the duty cycle of the output optical signal may be distorted; 2. High-speed transceiver chips have high power consumption and high cost; 3. Power control is completed through the APC circuit inside the integrated chip. Because it is a high-speed application, the APC circuit has a fast feedback speed and a high low-frequency cut-off frequency. When transmitting low-rate signals There will be signal distortion

[0005] In another existing solution, its dual-emitting optical module is packaged in SFF, which cannot support hot swapping

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