LIGHT TRANSMITTING DEVICE FOR LIGHT AMPLIFYING AND REPEATING TRANSMISSION

摘要

PURPOSE:To make it difficult to generate the large loss and the degradation of an SN based on polarization direction dependency of the loss of optical parts in a light repeating transmission system composed of the multistage repeatings by a light amplifier. CONSTITUTION:Non-polarized state light 22 in a prescribed band is taken out from non-polarized state light from a light emitting diode 26 by an optical band-pass filter 28, an intensity modulation is performed for this non-polarized state light by a transmission pattern 24 in an optical modulator 23 and the light is defined as transmission signal light 25. An intensity modulation is performed for polarized light 34 from a laser diode 33 by the transmission pattern 24 in the optical modulator 23, the emission signal light is fluctuated in a polarized direction at higher speed than the transmission pattern 24 in a polarized modulator 36 and the signal is defined as transmission signal light 37.