In the design of Ethernet fiber optic transceivers, the choice of components plays an important role, which determines the performance, life and cost of the products. The photoelectric dielectric conversion chip (OEMC) is the core of the transceiver. Selecting a dielectric converter chip is the first and most important step in the design of an Ethernet fiber optic transceiver. Its choice directly affects and determines the choice of other components.

The main performance indicators of the photoelectric dielectric conversion chip are:

1. Network management function

Network management is the guarantee of network reliability, is the way to improve network efficiency, network management operation, management, maintenance and other functions can greatly increase the network available time, improve the network utilization, network performance, quality of service, security and economic benefits. However, the manpower and material resources needed to develop Ethernet fiber transceiver with network management function are far more than similar products without network management, which are mainly manifested in:

(1) Hardware investment. The realization of network management function of Ethernet fiber transceiver requires a network management information processing unit to process network management information on the transceiver circuit board. The unit obtains management information by the management interface of dielectric conversion chip. Management information shares data channels with ordinary data on the network. Ethernet fiber-optic transceivers with network management function have more types and quantities of components than similar products without network management. Accordingly, the wiring is complex and the development cycle is long.

(2) Software investment. In addition to hardware wiring, software programming is more important in the research and development of Ethernet fiber-optic transceivers with network management function. Network management software development workload is large, including graphical user interface part, network management module embedded system part, transceiver circuit board network information processing unit part. Among them, the embedded system of network management module is particularly complex, and the research and development threshold is high, which requires the use of embedded operating system and the completion of complex software work.

(3) Commissioning work. The debugging of Ethernet fiber-optic transceiver with network management function includes two parts: software debugging and hardware debugging. During the commissioning process, circuit board wiring, component performance, component soldering, PCB board quality, environmental conditions, and any factor in software programming can affect the performance of Ethernet fiber optic transceivers. Debugger must have comprehensive quality and consider all kinds of factors of transceiver failure.

(4) Personnel input. The design of an ordinary Ethernet fiber optic transceiver can be accomplished by a hardware engineer. The design of Ethernet fiber optic transceiver with network management function requires not only hardware engineers to complete the circuit board wiring, but also many software engineers to complete the network management programming, and requires the close cooperation of hardware and software designers.

2. Compatibility

OEMC should support IEEE802, Cisco ISL and other common network communication standards to ensure good compatibility of Ethernet fiber transceivers.

3. Environmental requirements

A. Input and output voltages. The operating voltage of OEMC is usually 5 volts or 3.3 volts, but the operating voltage of optical transceiver module, another important component in Ethernet fiber transceiver, is mostly 5 volts. If the two operating voltages are not consistent, it will increase the complexity of PCB wiring.

B. Operating temperature. When choosing the operating temperature of OEMC, developers need to start from the most unfavorable conditions and leave room, such as the maximum temperature of 40℃ in summer, and Ethernet fiber transceiver case because of various components, especially OEMC heat. Therefore, the upper limit of the operating temperature of the Ethernet fiber transceiver should not be less than 50℃.