Abstract: “ACTIVE WAVELENGTH CONVERTER FOR USE WITH OTDR, composed of: an optoelectronic circuit 5, comprising a photodetector 6, an amplifier 7, a comparator 8, a laser driver 9, an output laser 10, a laser temperature control circuit 11, and an optical circuit 12, comprising an optical fiber segment 13 with a filtering device 14. The converter 4a is composed of an optoelectronic circuit 5, connected in parallel to the optical circuit 12 by a coupler 15 and a circulator 16. The optical signal emitted by the OTDR 1 through fiber 2a is received by the coupler 15 and sent to the optoelectronic circuit 5, where it is converted from an optical to an electric signal, amplified, saturated, reformatted and converted back to an optical signal again, at a wavelength different from the signal emitted by the OTDR 1. It is then sent to the circulator 16 that transmits this changed signal to the optical fiber 2b, where it is propagated.

Abstract: 1—“ACTIVE WAVELENGTH CONVERTER FOR USE WITH OTDR, composed of: an optoelectronic circuit 5, comprising a photodetector 6, an amplifier 7, a comparator 8, a laser driver 9, an output laser 10, a laser temperature control circuit 11, and an optical circuit 12, comprising an optical fiber segment 13 with a filtering device 14. The converter 4a is composed of an optoelectronic circuit 5, connected in parallel to the optical circuit 12 by a coupler 15 and a circulator 16. The optical signal emitted by the OTDR 1 through fiber 2a is received by the coupler 15 and sent to the optoelectronic circuit 5, where it is converted from an optical to an electric signal, amplified, saturated, reformatted and converted back to an optical signal again, at a wavelength different from the signal emitted by the OTDR 1. It is then sent to the circulator 16 that transmits this changed signal to the optical fiber 2b, where it is propagated.