Optical module DDM function

As the application of optical modules in optical communication becomes more and more extensive, its speed, packaging, power consumption and functions are all developing towards the direction of high speed, small size, low power consumption and multi-function. The optical modules provided by the suppliers on the market can basically support the digital diagnostic monitoring (DDM) function. In this article, Shenzhen Handar Optical will focus on introducing the optical module DDM function for you.

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What is the meaning of optical module DDM?

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DDM (that is, digital diagnostic monitoring) is formulated by the industry organization SFF Committee and works in accordance with the standard parameters defined by the SFF-8472 multi-source protocol, which regulates the standard values or ranges that the software and hardware of optical modules and network equipment need to follow, ensuring that the network The interoperability of products offered by equipment suppliers and optical module suppliers is different. DDM is a real-time parameter monitoring method for optical modules. It allows users to monitor the parameters of optical modules in real time, including operating voltage, operating temperature, received optical power, transmitted optical power and laser bias current.

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Detailed explanation of optical module DDM function

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The optical module DDM can monitor parameters, and also has functions of alarm, warning, fault prediction and fault location.

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Alarm function

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As we all know, only when the working environment of the optical module meets the standard can its optimal performance be ensured. If the environmental parameters of the optical module exceed the standard range, the performance of the optical module will be degraded and bit errors will occur. When an optical module supporting DDM exceeds the specified standard range (such as voltage exceeding the specified range, receiving optical power overload, temperature exceeding the operating temperature range, etc.), it will send an alarm to the system, indicating that the module is in a bad state. At this point, the transmitter will stop sending data, and the receiver will also refuse to receive data.

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Failure prediction

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Failure prediction refers to finding potential link failures before system performance is affected, that is, allowing network managers to switch services to backup links or replace optical modules that may fail before the failure occurs to ensure services uninterrupted business and repair failures. The fault prediction of the optical module DDM mainly refers to predicting the deterioration of the laser by monitoring the bias current of the laser, so as to ensure that it is replaced before it is broken. Principle: The optical module will control the output power to a stable level by increasing the bias current of the laser, and the aging of the laser (caused by long-term operation) will reduce the quantum efficiency of the laser, and the bias current of the laser will also decrease. It will be affected by it, thereby affecting the optical power of the optical module.

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Fault location

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Quickly locating fault locations is critical to business systems. Optical modules that support DDM can quickly locate link faults by comprehensively analyzing alarm signs or alarm conditions, monitoring parameter information, and optical module pins, thereby reducing system fault repair time.

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How to View Optical Module DDM Information?

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There are two main ways to view the DDM information of an optical module: SNMP and Commands.

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1.?SNMP, the Simple Network Management Protocol, is a standard protocol specially used for IP network management of network nodes. The optical module DDM information can read the received optical power and transmitted optical power of the optical module through SNMP.

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2.?Due to different brands of equipment suppliers, SNMP MIB (Management Information Base, management information base) and OID (Object Identifiers, object identifiers) are different, some devices can directly obtain DDM information through simple commands. For example, enter the Display command on a Huawei switch.

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All the optical modules provided by Shenzhen Handar Optical?have DDM functions, and are widely compatible with major brands of switches. You can buy with confidence! For more product information, you can pay attention to the official website www.huahanda.com,?or contact with : [email protected] mobil/whatsapp/skype: +86 13560356643.