Multimode fiber transmission system
AssigneeFujitsu Limited
InventorsToshihiro Ohtani, Masaki Satoh
Life of this patent
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Abstract
An optical signal propagating through a transmission line of a multimode fiber is branched by an MMF coupler of a reception device, and the intensity of the signal is detected by a MMF monitor PD. After connecting from the multimode fiber to a single-mode fiber, the optical signal is branched by a SMF coupler, and the intensity of the optical signal after the connection by a SMF monitor PD is detected. A coupling loss is calculated from the two detection results and the status of the occurrence of an error rate is estimated from the obtained coupling loss.
Claims10
A transmission system which receives an optical signal transmitted via a multimode fiber by a reception device for receiving a transmission signal through a single-mode fiber, comprising:
- an MMF light intensity detection device for detecting light intensity of an optical signal propagating in a multimode fiber at an input to a connection point between a multimode fiber and a single-mode fiber;
- an SMF light intensity detection device for detecting light intensity of an optical signal propagating in a single-mode fiber at an output from the connection point between the multimode fiber and the single-mode fiber;
- and a control device for obtaining a coupling loss of the connection point between the multimode fiber and the single-mode fiber from a detection result of the MMF light intensity detection device and the SMF light intensity detection device, and estimating an occurrence of errors of a signal in a reception device.
An optical apparatus comprising:
- a first detecting device detecting light intensity of an optical signal propagating in a multimode fiber at an input to a connection point between the multimode fiber and a single mode fiber, a second detecting device detecting light intensity of an optical signal propagating in the multimode fiber through single-mode fiber at an output from the connection point between the multimode fiber and the single mode fiber;
- an error estimating device estimating errors of an optical signal propagating in the multimode fiber from the detected intensity of said first detecting device and said second detecting device.
Dependencies are inferred from the claim text.