Wavelength monitoring device, light source device and optical module
A technology for monitoring devices and wavelengths, which is applied in the fields of wavelength monitoring devices, light source devices and optical modules, and can solve problems such as reducing the accuracy of input light detection
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no. 1 approach
[0025] figure 1 is a diagram illustrating an example of the configuration of the wavelength monitoring device 10 according to the first embodiment. Such as figure 1 Illustratively, the wavelength monitoring device 10 includes a polarization rotation element 11 , an etalon element 12 , a polarization beam splitter (PBS) 13 , and PDs 14 and 15 .
[0026] The polarization rotation element 11 is, for example, a Faraday rotator, and rotates the polarization direction of input light. Specifically, polarization rotation element 11 rotates the polarization direction of input light so that the polarization direction of input light is inclined by 45° (π / 4) with respect to the optical axis of birefringent layer 12 a of etalon element 12 , which will be described later. Furthermore, the rotation angle of the polarization direction of input light is not limited to 45°, as long as any angle larger than 0° and smaller than 90° is used.
[0027] The etalon element 12 is an optical filter e...
no. 2 approach
[0044] The second embodiment is characterized in that two transmission characteristics in the etalon element are obtained by normalizing two monitor values for monitoring the wavelength of input light with the optical power value of the input light.
[0045] Figure 4 is a diagram illustrating an example of the configuration of the wavelength monitoring device 20 according to the second embodiment. exist Figure 4 in, with figure 1 Components of the same configuration as the illustrated components are assigned the same reference numerals, and descriptions thereof will be omitted. Such as Figure 4 As an example, the wavelength monitoring device 20 includes figure 1 In addition to the illustrated configuration, a half mirror 21 and a PD 22 are included.
[0046] Half mirror 21 is provided between polarization rotation element 11 and etalon element 12 . The input light transmitted through the polarization rotation element 11 is incident on the etalon element 12 and the P...
no. 3 approach
[0050] The third embodiment is characterized in reducing the size of the device by providing a polarization switching element instead of the polarization rotation element, by switching the polarization direction, and by receiving input light transmitted through the etalon element by a single PD.
[0051] Figure 5 is a diagram illustrating an example of the configuration of the wavelength monitoring device 30 according to the third embodiment. exist Figure 5 in, with figure 1 Components of the same configuration as the illustrated components are assigned the same reference numerals, and descriptions thereof will be omitted. Such as Figure 5 Illustratively, the wavelength monitoring device 30 includes a polarization switching element 31, instead of figure 1 The polarization rotator element 11 is illustrated. In addition, the wavelength monitoring device 30 includes a PD 32 instead of figure 1 PBS 13, PD 14 and PD 15 are illustrated.
[0052] The polarization switching ...
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