LIGHT SOURCE REDUNDANCY SYSTEM IN OPTICAL COMMUNICATION

摘要

PURPOSE:To establish an optical relay unit with high reliability, by suppressing insertion loss through the use of optical multiplex circuit and constituting the light source in redundancy system. CONSTITUTION:Light sources S1, S2, S3, S4 producing the optical energy in different wavelengths lambda1, lambda2, lambda3, lambda4, are coupled to the optical multiplex circuit with the optical fiber (f). The optical multiplex circuit 13 is an internal reflection film type photo multiplex circuit using convergent rod lens of four wavelengths, which performs wavelength multiplex for the optical inputs of IN1, lambda1, IN2, lambda2, IN3, lambda3, and IN4, lambda4, and outputs them at the output OUT. Thus, if a failure is taken place in the light source during operation, the light source is selected and high reliability can be obtained as a whole even with low reliability for each light source.