Research Of Long-Wavelength Pass Filter

Wavelenght Division Multiplexing (WDM) of 1310/1550nm is applied widely in Fiber Optic Communication at present. So it have both wide market and foreground. Long-Wavelength Pass Filter is important part of Wavelenght Division Multiplexing, And its capability affect the quality of Wavelenght Division Multiplexing straightway. From introducing its function in Wavelenght Division Multiplexing and theory, This paper fetch out researchful intention and significance about Long-Wavelength Pass Filter. In this paper, it expatiates film theory and microcosmic process of film growing. As emphasis, the paper introduces the choice of film materials, coating design, and deposition process. At last it analyed the reason.