An optical fiber and the optical fiber light path monitors the writing means writing

The present invention discloses an optical fiber and an optical path inscribed monitoring optical writing system, comprising: a light source for emitting detection light; a light circulator, a first annular port, a second port and a third annular ring ports, a first annular port connected to the light source, a second port for connecting a first annular end of the fiber to be inscribed; a first optical switch, a first switch is provided with a port, the second switch and the third switch terminal port, a first switching port and the third port ring connector, a second switch port for writing the other end of the fiber to be connected to the first; spectrometer, connected to the third port of the switch; when the communication port and the third switching port of the first switch, the spectrometer detects the reflection spectrum of the optical fiber to be inscribed, when the communication port the third switch and the second switch port, a spectrometer detector be inscribed transmission spectra of the optical fiber. By the above-described embodiment the optical path, the present invention enables the monitoring of the first transmission spectrum to be inscribed and the reflection spectrum of a common light source and optical spectroscopy, cost savings.