A low-cost sfp module with high-precision digital diagnostic function

Abstract

The invention, which relates to the fiber optical communication technology field, discloses a small from-factor pluggable (SFP) module with low costs and a high precision digit diagnosis function. The invention aims at providing a SFP module which is with low costs and possesses a digital diagnosis function provided in a SFF-8472. The invention is characterized in that: using a single chip, which is integrated by a laser driver and a limiting amplifier, and cooperating with a controller unit so as to realize a high precision digit diagnosis function; accessing a filter between a light receiving interface component, the laser driver and the limiting amplifier of a limiting amplifier unit so as to improve sensitivity of the module and signal quality; adopting a applied resistor mode to a pin of a digital potentiometer of the controller unit so as to avoid a fault problem of nonluminescence when power is on. The SFP module can be used for a LC bi-directional single fiber SFP module, a SC bi-directional single fiber SFP module and a LC two fiber SFP module.

Description

technical field [0001] The invention relates to optical fiber communication technology, in particular to an SFP module with high-precision digital diagnosis function. Background technique [0002] Explanation of abbreviations in the text [0003] APC (Automatic Power Control) automatic power control [0004] APD (Avalanche Photo Diode) Avalanche Photodiode [0005] BOSA (Bidirectional Optical Sub-Assembly) bidirectional interface assembly [0006] DDM (Digital Diagnostic Monitor) digital diagnostic monitoring [0007] LA (Limit Amplifier) ​​Limiting Amplifier [0008] LDD (Laser Diode Driver) laser diode driver [0009] MSA (Multi-Source Agreement) multi-source agreement [0010] PIN (Positive Intrinsic-Negative) PIN diode [0011] ROSA (Receiver Optical Sub-Assembly) optical receiving interface assembly [0012] SFP (Small From-Factor Pluggable) Small Form Factor Pluggable Optical Module [0013] TIA (Trans-Impedance Amplifier) ​​transimpedance amplifier [0014] ...

AI Technical Summary

Problems solved by technology

[0018] 1. The scheme of independent laser driver chip and limiting amplifier chip is not high in integration, there are many peripheral devices, and the cost of optical module is high;

[0019] 2. Using a general-purpose microprocessor, the ADC generally has only 8 to 10 bits, and the resolution is limited, so the accuracy and range of the digital diagnosis realized are low;

[0020] 3. Generally, an external digital potentiometer or resistor or potentiometer is used to adjust the light output parameters, which increases the material cost of the optical module or the difficulty and consistency of debugging

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