Single optical fibre bidirectional optical transmission system and single optical fibre bidirectional optical amplifier
An optical amplifier and bidirectional transmission technology, applied in the field of single fiber bidirectional optical transmission system and single fiber bidirectional optical amplifier
Active Publication Date: 2007-10-24
NEC CORP
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However, the problem is that so far this has not been considered
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Embodiment Construction
[0053] Embodiments of the present invention will be described next with reference to the drawings. FIG. 1 is a block diagram showing the construction of a single-fiber bidirectional optical transmission system of a first embodiment of the present invention. In Fig. 1, an optical terminal A of the transmission path consists of a single-fiber bidirectional optical amplifier 1, a first optical transmitter (Tx) 2 and a first optical receiver (Rx) 3, and the optical terminal A passes through an optical circulator 4 Connect to single fiber bidirectional transmission path 5.
[0054] Another optical terminal B of the transmission path is composed of a second optical transmitter (Tx) 7 and a second optical receiver (Rx) 8, and the optical terminal B passes through an optical circulator 6 and is connected to a single-mode optical fiber Optical fiber bidirectional transmission path 5.
[0055] The single-fiber bidirectional optical amplifier 1 comprises an optical amplification part 1...
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The present invention provides a single fibre bidirectional optical transmission system capable of realizing the extension of a single fibre bidirectional long distance at a moderate price. An optical signal outputted from a second optical transmitter is incident on an optical amplifying portion passing through an optical circulator, a single fibre bidirectional transmission path, an optical circulator and an optical Blue / Red filter. The optical signal outputted from a first optical transmitter is incident on the optical amplifying portion passing through a dispersion compensator and the optical Blue / Red filter. By inserting the dispersion compensator immediately after the first optical transmitter, a difference between a power level by which the optical signal from the first transmitter is inputted to the optical amplifier and the power level by which the optical signal from the second optical transmitter is inputted to the optical amplifier is made small, so that, even when the optical amplifier is installed at one end of the transmission path, both of the bidirectional signals can obtain sufficient gains, thereby realizing a bidirectional collective amplification.
Description
technical field [0001] The present invention relates to a single-fiber bidirectional optical transmission system and a single-fiber bidirectional optical amplifier. More specifically, the present invention relates to a single-fiber bidirectional optical amplifier, which is used in single-fiber bidirectional optical transmission using a single optical fiber for bidirectional transmission. An optical amplifier is used to amplify bidirectional optical signals together. Background technique [0002] In the single-fiber bidirectional optical transmission technology for bidirectional transmission using one optical fiber, the number of optical fibers to be used is reduced by half compared to the dual-fiber bidirectional transmission in which two optical fibers perform unidirectional transmission respectively. Therefore, when a new optical fiber needs to be laid, the optical fiber laid is reduced by half, and when a bare optical fiber (dark fiber) is used, the optical fiber cost is ...
Claims
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IPC IPC(8): H01S3/00H01S3/10G02B6/00G02F1/00G02B6/42H01S3/06H04B10/00H04B10/297H04B10/524H04B10/58H04J14/00H04J14/02
CPCH04B10/2971H04B10/40H04J14/0221H04B10/2525H04B2210/254H04B2210/252
Inventor 前田和佳子田岛章雄
Owner NEC CORP