Device and application method for increasing optical modulation amplitude of SFP optical module

Abstract

The invention discloses a device for increasing the light modulation amplitude of an SFP light module. The device comprises a boosting device, wherein the boosting device is arranged between a VCCT power supply interface of an emitting end of the SFP light module and a driving circuit of a laser and is used for increasing drive current of the laser so as to increase the light modulation amplitude of SFP light module. According to the device, the driving circuit of the laser is improved to supply relatively large drive current, so that the laser can provide relatively large light modulation amplitude and can support that light signals can be transmitted to a relatively far distance. The invention further provides an application method. The application method shows that the increase of the drive current of the laser is the only method for increasing the light modulation amplitude when the emitting efficiency of the laser is known.

Description

Technical field [0001] The invention relates to a device for increasing the optical modulation amplitude of an SFP optical module by increasing the voltage of a laser driving circuit. Background technique [0002] SFP is an optical module packaging form with a wide range of applications. The structural size and electrical and optical interface modes of the package are regulated by multiple agreements in the industry. Electrical interface by figure 1 As shown, VCCT and VCCR are the power supply for the transmitting part and the receiving part of the optical module respectively. The multi-protocol stipulates that the power supply is 3.3V+-5%, figure 1 The definition of each electrical interface of the SFP optical module. [0003] The optical modulation amplitude of the optical module is mainly determined by the luminous efficiency of the semiconductor laser and its working current. Such as figure 2 Shown, I BIAS Is the DC bias current of the laser, I MOD Is the AC modulation curr...

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Problems solved by technology

[0010] Therefore, in the laser drive circuit of the existing sfp optical module, when I MOD , I BIAS When it is increased to a certain amount, if the sum of the transient voltage drop required on the laser and the damping resistor and the driver chip exceeds 3.3V, the laser driver can no longer provide a higher I MOD electric current

That is to say, theoretically, by increasing the driving current of the laser, the laser can provide a higher optical modulation amplitude, but in fact, it is often limited by the transient voltage drop of the driving circuit, and the driving current supply capability is limited, so it is impossible to continue to improve the SFP optical module. Optical Signal Modulation Amplitude

[0011] Therefore, as mentioned above, limited by the SFP optical module multi-protocol, the sum of the laser and damping resistance and the transient voltage drop required by the driver chip when the drive circuit is working can only reach 3.3V at most. Usually, the laser driver is affected by Limited to this voltage drop can not provide greater drive current

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