Multichannel fiber bragg grating chromatic dispersion compensator
A dispersion compensator and fiber grating technology, applied in the field of optical information, can solve the problems of increasing the difficulty and cost of production, and achieve the effect of improving utilization rate, high energy efficiency and easy realization
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Embodiment 1
[0024] This embodiment provides a multi-channel fiber grating dispersion compensator, which uses an optical fiber as a base material, and the grating written on it is an interleaved amplitude sampling grating. In one sampling period, it includes i grating periods with different central wavelengths. The sampling function for one sampling period is expressed as:
[0025] s i ( z ) = rect ( z - p i / 2 p i ) ⊗ Σ m δ ( z - mP ) exp [ - j 2 πm ...
Embodiment 2
[0041] This embodiment adopts the following parameters: the corresponding central wavelength of the interleaved amplitude sampling grating is λ 1 =1547.977nm, λ 2 =1550nm, λ 3 = The chirp coefficients of 1552.023nm are c 1 、c 2 、c 3 , the specific parameter is c 1 =5.70×10 -5 , c 2 =c 3 =0( image 3 Curve 1), c 1 =c 2 =c 3 =1.90×10 -5 ( image 3 Curve 2) and c 1 =c 2 =c 3 =1.90×10 -5 ( image 3 Curve 3), other parameters are with embodiment one.
[0042] See attached image 3 , which is the reflection spectrum of the interleaved amplitude sampling grating with different center wavelengths under the same total chirp amount. Among them, curve 1 (square point curve) is only λ 1 Chirp occurs (c 1 =5.70×10 -5 , c 2 =c 3 =0) graph; curve 2 (circular point curve) is λ 2 , lambda 3 Chirp occurs while λ 1 Chirp does not occur (c 2 =1.90×10 -5 , c 3 =3.7×10 -5 , c 1 =0) graph; Curve 3 (triangular point curve) is λ 1 , lambda 2 , lambda 3 Simultaneous ...
Embodiment 3
[0045] In this embodiment, the following parameters are used: the chirp coefficient and the center wavelength of the interleaved amplitude sampling fiber grating are respectively λ 1 =1547.977nm, λ 2 =1550nm, λ 3 = Corresponding to 1552.023nm, respectively: c 1 =c 2 =c 3 =1.26×10 -5 ; Traditional amplitude-type sampling fiber grating center wavelength λ 0 = The chirp coefficient of 1550 is c 0 =3.78×10 -5 . Other parameters are the same as those in Embodiment 1.
[0046] See attached Figure 5 , it can be seen from Figure (a) that when the traditional amplitude sampling grating is chirped, the reflection spectrum will overlap adjacent spectra due to the broadening of the spectrum, and the isolation between channels will decrease, which affects the grating It can be seen from Figure (b) that under the same total chirp coefficient, the spectral isolation between the reflection channels of the interleaved amplitude sampling grating provided in this embodiment is still g...
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