Tunable optical filter and optical channel monitoring module
An optical filter and actuator technology, applied in the field of optical communication, can solve the problem of narrow bandwidth of tunable optical filter, and achieve the effects of low cost, improved spectral resolution, and large dispersion
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Embodiment 1
[0034] refer to figure 1 , the embodiment of the present invention provides a kind of tunable optical filter, including setting along the optical path: fiber port 21, collimator lens 22, cascaded diffraction grating and mirror 25, said fiber port 21 includes at least one input port and output port Port, the tunable optical filter also includes a micro-transmission mechanism, the micro-transmission mechanism is used to drive the deflection of the mirror 25, wherein the optical signal is incident on the input port and the collimator lens 22 in sequence The cascaded diffraction grating is dispersed into diffracted light with different diffraction angles, and enters the mirror 25, and the mirror 25 reflects the diffracted light in a specific direction, and then passes through the cascaded diffraction grating, the The collimating lens 22 is incident to the output port.
[0035]By implementing this embodiment, an optical fiber port 21, a collimating lens 22, a cascaded diffraction ...
Embodiment 1
[0056] In Embodiment 1, the collimating lens 22 in FIG. 2 is a plano-convex aspheric lens, which is beneficial to eliminate spherical aberration to the greatest extent. Its focal length is f=10mm. The collimated spot diameter is D=1.9mm.
[0057] In Embodiment 1, the two adjacent cascaded diffraction gratings 23 and 24 in FIG. 2 may be transmission type or reflection type, preferably transmission type diffraction gratings. Its incident and diffraction angles follow the grating equation as follows:
[0058] m·λ=Λ·(sin θ i +sin θ d ) (2)
[0059] In formula 2, m is the diffraction order, such as -2, -1, 0, +1, +2, dimensionless;
[0060] λ is the wavelength of the optical signal, in nm;
[0061] Λ is the grating period, the unit is nm;
[0062] θ i and θ d are the angle of incidence and the angle of diffraction corresponding to the order of diffraction, respectively.
[0063] The grating period Λ ranges from 800 to 1700 nm, and the grating periods of the two gratings ca...
Embodiment 2
[0069] An embodiment of the present invention provides a tunable optical filter, including: an optical fiber port 41, a collimating lens 42, a cascaded diffraction grating and a mirror 45 arranged along the optical path, and the optical fiber port 41 includes at least one input port and an output port , the tunable optical filter also includes a micro-actuation mechanism, the micro-actuation mechanism is used to drive the deflection of the cascaded diffraction grating, wherein the optical signal is incident on the input port and the collimator lens 42 in sequence The cascaded diffraction grating is dispersed into diffracted light with different diffraction angles, and enters the mirror 45, and the mirror 45 reflects the diffracted light in a specific direction, and then passes through the cascaded diffraction grating, the diffracted light The collimator lens 42 is incident to the output port.
[0070] By implementing this embodiment, an optical fiber port 41, a collimating len...
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