Patent ID: 7343094
Filing Date: 2008-03-11
Classification: H04B

Abstract:
1. A transmission characteristics evaluation system comprising an optical transmitting apparatus for transmitting an optical signal, an optical receiving apparatus for receiving the optical signal from the optical transmitting apparatus, and a pseudo transmission path apparatus interposed between the optical transmitting apparatus and the optical receiving apparatus, said pseudo transmission path apparatus having simulated transmission characteristics of a transmission path to which the optical transmitting apparatus and the optical receiving apparatus are to be connected, said transmission characteristics evaluation system evaluating transmission characteristics of the optical transmitting apparatus or the optical receiving apparatus by transmitting and receiving an optical test signal between the optical transmitting apparatus and the optical receiving apparatus, wherein the optical transmitting apparatus comprises a pulse signal generator for generating an electric pulse signal of a specific pattern and an electric/optical converting section capable of converting the electric pulse signal generated by the pulse signal generator into an optical signal, said optical transmitting apparatus being constructed to transmit the optical signal from the electric/optical converting section as said optical test signal, the pseudo transmission path apparatus comprises an optical element for emitting the signal light transmitted by the optical transmitting apparatus at an output angle that is different depending on a wavelength by subjecting the signal light to multiple reflection for self interference, a lens for converging the signal light emitted from the optical element, a mirror for reflecting the signal light converged by the lens to return the signal light to the lens so that the returned signal light may receive multiple reflection in the optical element to be output as a signal light to the optical receiving apparatus, said mirror being capable of giving a different wavelength dispersion to the signal light to the optical receiving apparatus depending on a reflection surface position of the signal light converged by the lens, and a transmission characteristics setting section for setting transmission characteristics equivalent to transmission characteristics that the transmission path to which the optical transmitting apparatus and the optical receiving apparatus are to be connected can have, by controlling the mirror or the optical element, and the optical receiving apparatus comprises an optical/electric converting section being capable of converting the optical signal from the optical transmitting apparatus into an electric signal by receiving an input of the optical signal via the pseudo transmission path apparatus in which the transmission characteristics have been set, and a signal error measuring device for measuring a signal error by comparing the electric signal from the optical/electric converting section with the electric pulse signal generated by the optical pulse signal generator, whereby the transmission characteristics of the electric/optical converting section or the optical/electric converting section are evaluated in accordance with the signal error measured by the signal error measuring device of the optical receiving apparatus.