Polarization related outputting multiple wavelength and passive mode locking optical fiber laser

Abstract

The present invention discloses a polarization relevant output multi-wavelength and passive mode-locking optical fiber laser which belongs to laser and light communication field. A ring laser cavity includes Er-doped fiber that is taken as gain medium; a 980nm / 1550nm wavelength-division multiplexer is used to couple pumping laser of 980nm into the Er-doped fiber; a polarization relevant isolator with tail optical fiber on two ends guaranties the laser work in one way, meanwhile plays the role of a polarizer; two polarization controllers respectively on two side of the polarization relevant isolator are used to control polarization state, a 10dB coupler with 10% of the terminal port used to output optical signal and 90% of the optical signal stays in the cavity for cycle. A segment of long single mode fiber is inserted in the laser cavity and used to increase nonlinear effect inside the laser cavity; a piece of polarization maintaining optical fiber and a polarization relevant isolator constitute a birefraction optical fiber periodicity filter; the optical fiber laser is provided with two different output modes, namely mode locking pulse output and multi- wavelength continuous wave output, and can adjust polarization and switch between the two output modes.

Description

[0001] technology neighborhood

[0002] The invention relates to the field of laser and optical communication, in particular, it provides a multi-wavelength and passive mode-locked fiber laser with polarization-dependent output. Background technique

[0003] Light source technology is one of the key technologies in optical communication technology. Currently, semiconductor lasers are mainly used as light sources in commercial optical fiber communication systems. Compared with semiconductor lasers, fiber lasers have many excellent characteristics: the fiber-to-fiber coupling technology is mature, which can have higher coupling efficiency and stability; the fiber has quite a lot of adjustable parameters and selectivity, so the laser can be obtained There are quite a lot of spectral lines; at the same time, the fiber matrix has a wide fluorescence spectrum, and a wide tunable range and good monochromaticity can be obtained by inserting appropriate filters. Therefore, fiber laser...

Examples

Embodiment Construction

[0014] In the ring laser cavity, the linearly polarized light coming out of the polarization-dependent isolator becomes elliptically polarized light due to the action of the second polarization controller (6), and the elliptically polarized light can be regarded as left and right circularly polarized light with different intensities The superposition of left and right circularly polarized light with different intensities due to the optical Kerr effect will experience unequal nonlinear phase shift when passing through a single-mode fiber, so the synthesized polarization state rotates with the propagation of light, and the angle of rotation related to light intensity. There is another polarization controller (5) before the light reaches the polarization-dependent isolator again, and adjusting the polarization controller (5) can change the light intensity passing through the polarization-dependent isolator. Therefore, the combination composed of the polarization controller, the s...

[0001] technology neighborhood

[0002] The invention relates to the field of laser and optical communication, in particular, it provides a multi-wavelength and passive mode-locked fiber laser with polarization-dependent output. Background technique

[0003] Light source technology is one of the key technologies in optical communication technology. Currently, semiconductor lasers are mainly used as light sources in commercial optical fiber communication systems. Compared with semiconductor lasers, fiber lasers have many excellent characteristics: the fiber-to-fiber coupling technology is mature, which can have higher coupling efficiency and stability; the fiber has quite a lot of adjustable parameters and selectivity, so the laser can be obtained There are quite a lot of spectral lines; at the same time, the fiber matrix has a wide fluorescence spectrum, and a wide tunable range and good monochromaticity can be obtained by inserting appropriate filters. Therefore, fiber laser...

Examples

Embodiment Construction

[0014] In the ring laser cavity, the linearly polarized light coming out of the polarization-dependent isolator becomes elliptically polarized light due to the action of the second polarization controller (6), and the elliptically polarized light can be regarded as left and right circularly polarized light with different intensities The superposition of left and right circularly polarized light with different intensities due to the optical Kerr effect will experience unequal nonlinear phase shift when passing through a single-mode fiber, so the synthesized polarization state rotates with the propagation of light, and the angle of rotation related to light intensity. There is another polarization controller (5) before the light reaches the polarization-dependent isolator again, and adjusting the polarization controller (5) can change the light intensity passing through the polarization-dependent isolator. Therefore, the combination composed of the polarization controller, the s...

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