Planar optical waveguide adjustable optical attenuator and its adjustment method
A planar optical waveguide, dimming attenuation technology, applied in instruments, optics, nonlinear optics, etc., can solve the problems of poor performance and large polarization-related loss parameters of VOA, and achieve the effect of improving performance and reducing total polarization-related loss.
Active Publication Date: 2017-01-04
SOLOREIN TECH
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[0003] However, the polarization-dependent loss parameter of the planar optical waveguide VOA in the prior art is large and the performance is poor
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[0049] As mentioned in the background section, the performance of the planar optical waveguide VOA in the prior art is relatively poor.
[0050] The inventors have found through research that this is because among many VOA technical performance indicators, the polarization dependent loss parameter (Polarization Dependent Loss, PDL) is one of the key performance parameters. The smaller the PDL, the better the performance of the VOA, on the contrary, the larger the PDL, the worse the performance of the VOA.
[0051] However, in the planar optical waveguide VOA in the prior art, due to the stress imbalance phenomenon inside the waveguide structure, birefringence occurs when the light passes through the planar optical waveguide VOA, so that the light of different polarization states is input into the planar optical waveguide VOA Among them, after passing through the planar optical waveguide VOA, the output light energy is inconsistent in size, which makes the polarization-dependen...
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The invention discloses a planar optical waveguide variable optical attenuator and an adjusting method of the planar optical waveguide variable optical attenuator. The planar optical waveguide variable optical attenuator comprises a first planar optical waveguide MZI type variable optical attenuator body and a second planar optical waveguide MZI type variable optical attenuator body, the output end of the first planar optical waveguide MZI type variable optical attenuator body is connected with the input end of the second planar optical waveguide MZI type variable optical attenuator body, a polarization dependent loss value of the first planar optical waveguide MZI type variable optical attenuator body and a polarization dependent loss value of the second planar optical waveguide MZI type variable optical attenuator body can be offset by adjusting a phase difference of the first planar optical waveguide MZI type variable optical attenuator body and a phase difference of the second planar optical waveguide MZI type variable optical attenuator body with the adaptation of the formula (please see the specifications for the formula), a total polarization dependent loss of the planar optical waveguide variable optical attenuator is further reduced, and the performance of the planar optical waveguide variable optical attenuator is improved.
Description
technical field [0001] The invention relates to the technical field of manufacture of adjustable optical attenuators, in particular to a planar optical waveguide adjustable optical attenuator and an adjusting method thereof. Background technique [0002] Variable Optical Attenuation (VOA) is one of the important optical devices in optical communication systems. Among them, the PLC (Planar Lightwave Circuit, planar light waveguide) MZI (Mach-Zehnder Interferometer, Mach-Zehnder interferometer) type VOA has the advantages of simple fabrication, good stability, small size, low cost, easy integration, and suitable for mass production. , and with the development and maturity of technology, it has become one of the most critical optical devices in optical communication systems. [0003] However, the polarization-dependent loss parameter of the planar optical waveguide VOA in the prior art is large, and the performance is poor. Contents of the invention [0004] In order to sol...
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IPC IPC(8): G02F1/01
Inventor 尚宏博邓晓清朱本均李朝阳
Owner SOLOREIN TECH