Optical fiber communication detector MFOD3100

The main function of a photodetector is to convert optical signals into electrical signals. It is an important component in modern fiber optic communication systems. The photodetectors currently used in optical fiber communication systems are mainly phase-shifted switching diodes, namely PIN diodes. PIN diodes have a rectifying effect on low-frequency signals, but only have an impedance effect on high-frequency signals. The size of the impedance value is determined by the middle layer. When the middle layer is forward biased, the device shows low resistance because carriers are injected into the middle layer; when the middle layer is not zero biased or reverse biased, the device shows high resistance. This can be used for information detection.

In addition to PIN diodes, avalanche photodiodes can also be used as photodetectors, and their working principles are roughly the same. However, countries around the world are currently developing new photodetectors with higher performance. The following introduces the MFOD3100 photodetector produced by Motorola Semiconductor Company in the United States.

1 Features of MFOD3100 photodetector

MFOD3100 can be used as infrared radiation detection in high-frequency fiber optic systems. It can be directly used on the connectors of standard optical fiber communication systems. At the same time, it can also be used in closed-circuit television, video systems, various microprocessor systems, industrial controls, computers and peripherals, etc. Its main features are as follows:

●Fast response, maximum 5ns at 5V;

●Analog bandwidth is greater than 100MHz;

●Can be matched with Motorola fiber optic transmitter;

●Using plastic packaging, small size, light weight, strong and durable;

●Very suitable for Amp#228756-1, Amphenol#905-138-5001, OFT1#PCR001 and other receiving devices;

●Low cost and cheap price.

2 Main parameters

Table 1 lists the main technical parameters of the MFOD3100 photodetector.

Table 1 Optoelectronic characteristics table TA=25℃

Figure 1 is a cross-sectional view of the MFOD3100 photodetector; Figures 2 and 3 are its relative spectral response curve and the relationship curve between dark current and temperature respectively.

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