| 摘要 |
PURPOSE:To obtain an optical wavelength converter which converts an input light signal directly to an output light signal differing in wavelength by providing a semiconductor P-N junction element having a special function and an optical filter. CONSTITUTION:A source voltage VB is applied to a semiconductor P-N junction element 4 such as semiconductor laser and the element is grounded through a load resistor RL, whereby the implantation current I0 larger than an oscillation threshold is supplied to the element 4. An input light signal of a wavelength lambdai is implanted into the active layer of the element 4 from one terminal thereof and an output light signal is drawn out from the other terminal. The output light signal is passed through an optical filter 5 using, for example, an optical demultiplexer, so that only the light signal of the oscillation wavelength lambdam of the element 4 among the output signals is passed therethrough, whereby the conversion of the optical wavelength is accomplished. Here the phases of the input light signal lambdai and the output light signal are inverted, but the output signal of the same phase is obtainable by performing the similar conversion of the optical wavelength again. |
