Optical fiber transmission system and supervision method of the same

An optical repeater for amplifying a data optical signal (with a wavelength of .lambda.d), comprising:

• an optical fiber amplifier including at least a doped fiber, first and second pumping light sources for outputting first pumping light (with a wavelength of about .lambda.p') and second pumping light (with a wavelength of about .lambda.p"), a wavelength demultiplexer for demultiplexing a supervisory optical signal 1 (with a wavelength of about .lambda.w) which is multiplexed with said data optical signal and transmitted, a first wavelength multiplexer for multiplexing the first pumping light in the same direction as that of the data optical signal which is demultiplexed by said wavelength demultiplexer, and a second wavelength multiplexer, which is mounted behind said doped fiber, for multiplexing the second pumping light in the opposite direction to that of said amplified data optical signal, and a third wavelength multiplexer, which is mounted behind said second wavelength multiplexer, for multiplexing a supervisory optical signal 2 (with a wavelength of about .lambda.w) in the same direction as that of the data optical signal;
• and a supervisory equipment including a supervisory optical receiver coupled to the wavelength demultiplexer, for receiving said supervisory optical signal 1 and outputting a supervisory electric signal 1, a controller for adding supervisory information to said supervisory electric signal 1 and outputting a supervisory electric signal 2, and a supervisory optical transmitter coupled to the third wavelength multiplexer, for converting said supervisory electric signal 2 to said supervisory optical signal.

An optical repeater for amplifying a data optical signal (with a wavelength of .lambda.d), comprising:

• an optical fiber amplifier including at least a doped fiber, first and second pumping light sources for outputting first pumping light (with a wavelength of about .lambda.p') and second pumping light (with a wavelength of about .lambda.p"), a first wavelength multi- and demultiplexer, which is mounted before the first doped fiber, for demultiplexing a supervisory optical signal 1 (with a wavelength of about .lambda.p) which is multiplexed with said data optical signal simultaneously, a second doped fiber which is mounted behind the first doped fiber, second, third, fourth, and fifth pumping light sources (with a wavelength of .lambda.p) for outputting second, third, fourth, and fifth pumping lights for pumping the second doped fiber, a first polarization prism for composing the second and third pumping lights in the orthogonally polarized state and outputting first composite pumping light, a wavelength multiplexer, which is mounted before said second doped fiber, for multiplexing said first composite pumping light and a data optical signal outputted from the first doped fiber, a second polarization prism for composing the fourth and fifth pumping lights in the orthogonally polarized state and outputting second composite pumping light, and a second wavelength multi- and demultiplexer, which is mounted behind the second doped fiber, for multiplexing said second composite pumping light in the opposite direction to that of said amplified data optical signal and for multiplexing a supervisory optical signal 2 (with a wavelength of about .lambda.p) in the same direction as that of said data optical signal simultaneously;
• and a supervisory equipment including a supervisory optical receiver coupled to the first multi- and demultiplexer, for receiving said supervisory optical signal 1 and outputting a supervisory electric signal 1, a controller for adding supervisory information to said supervisory electric signal 1 and outputting a supervisory electric signal 2, and a supervisory optical transmitter coupled to the second multi- and demultiplexer, for converting said supervisory electric signal 2 to said supervisory optical signal 2.

An optical repeater for amplifying a data optical signal (with a wavelength of .lambda.d), comprising:

• an optical fiber amplifier including at least a doped fiber, a first pumping light source for outputting first pumping light (with a wavelength of about .lambda.p'), a second pumping light source for outputting second pumping light (with a wavelength of about .lambda.p) which is multiplexed with said data optical signal and for multiplexing the first pumping light in the same direction as that of said data optical signal simultaneously, and a second wavelength multi- and demultiplexer, which is mounted behind said second doped fiber, for multiplexing the second pumping light in the opposite direction to that of said amplified data optical signal and for multiplexing a supervisory optical signal 2 (with a wavelength of about .lambda.p) in the same direction as that of said data optical signal simultaneously;
• and a supervisory equipment including a supervisory optical receiver coupled to the first wavelength multi- and demultiplexer, for receiving said supervisory optical signal 1 and outputting a supervisory electric signal 1, a controller for adding supervisory information to said supervisory electric signal 1 and outputting a supervisory electric signal 2, and a supervisory optical transmitter coupled to the second wavelength multi- and demultiplexer, for converting said supervisory electric signal 2 to said supervisory optical signal 2.

An optical repeater for amplifying a data optical signal (with a wavelength of .lambda.d), comprising:

• an optical fiber amplifier including at least first and second doped fibers coupling in series, a first pumping light source (with a wavelength of above .lambda.p') for outputting pumping light, a second pumping light source (with a wavelength of about .lambda.p) for outputting pumping light, a first wavelength multi- and demultiplexer, which is mounted before the first doped fiber, for demultiplexing a supervisory optical signal 1 (with a wavelength of about .lambda.p) which is multiplexed with said data optical signal and for multiplexing said pumping light (with a wavelength of about .lambda.p') in the same direction as that of said data optical signal simultaneously, and a second wavelength multi- and demultiplexer, which is mounted behind the second doped fiber, for multiplexing said pumping light (with a wavelength of .lambda.p) in the opposite direction to that of said amplified data optical signal and for multiplexing a supervisory optical signal 2 (with a wavelength of about .lambda.p) in the same direction as that of said data optical signal simultaneously;
• and a supervisory equipment including a supervisory optical receiver coupled to the first wavelength multi- and demultiplexer, for receiving said supervisory optical signal 1 and outputting a supervisory electric signal 1, a controller for adding supervisory information to said supervisory electric signal 1 and outputting a supervisory electric signal 2, and a supervisory optical transmitter coupled to the second wavelength multi- and demultiplexer, for converting said supervisory electric signal 2 to said supervisory optical signal 2.

An optical repeater for amplifying a data optical signal (with a wavelength of .lambda.d), comprising:

• an optical fiber amplifier including at least a doped fiber, first and second pumping light sources (with a wavelength of about .lambda.p') for outputting first and second pumping lights, a first wavelength multi- and demultiplexer, which is mounted before said doped fiber, for demultiplexing a supervisory optical signal 1 (with a wavelength of about .lambda.p) which is multiplexed with said data optical signal and for multiplexing the first pumping light in the same direction as that of said data optical signal simultaneously, and a second wavelength multi- and demultiplexer, which is mounted behind said doped fiber, for multiplexing the second pumping light in the opposite direction to that of said amplified data optical signal and for multiplexing a supervisory optical signal 2 (with a wavelength of about .lambda.p) in the same direction as that of said data optical signal simultaneously;
• and a supervisory equipment including a supervisory optical receiver coupled to the first wavelength multi- and demultiplexer, for receiving said supervisory optical signal 1 and outputting a supervisory electric signal 1, a controller for adding supervisory information to said supervisory electric signal 1 and outputting a supervisory electric signal 2, and a supervisory optical transmitter coupled to the second wavelength multi- and demultiplexer, for converting said supervisory electric signal 2 to said supervisory optical signal.