The plastic optical fiber system is now the most economic and most competing optical transmission systems in distances within 50M.The core of the fiber is 1mm and it is easy to couple and low in price.The development of quartz optical fiber systems is very raped. Many research works are devoted to the temperature dependence of light source devices of the system and a lot of schemes are developed to keep the light output constant at different temperatures

as the light feedback method

but this is a relatively expensive method in price.The plastic fiber system use low cost superradiant LED and infrared LED

But it's temperature characteristics and temperature compensation method are not commonly at hand. So it is necessary to study the temperature characteristics and compensation methods specially suitable to LED for he plastic optical systems. This paper studied the temperature characteristics and compensation methods of GaAlAs superradiance LED and GaAs infrared LED. It is pointed out that the GaAlAs superradiance LED is superior to the GaAs infrared LED in temperature

characteristics

life time and frequency response. Especially in temperature characteristics

the former is notably better than the latter. So

for the plastic optical fiber systems

the GaAlAs super radiance LED is recommended.In this paper

we use the silicon diodes with a negative temperature coefficient as the compensating element. Two experimental circuits are used and analysed. It is noteworthy that for GaAlAs superradiance LED and GaAs LED in temperature ranges of 5℃-60℃ the results are.1. The power level variation 2.2% the current change is 1.8mA. 2. the power level variation 3%

the current change is 0.8mA.So the methods recommended in this paper are both suitable for plasjc fiber optical system and for optical fiber sensor systems.