Tunable chromatic dispersion compensation device and method
A tunable chromatic dispersion compensation device used to compensate chromatic dispersion of wavelength of at least one predetermined wavelength band of light signal is provided. The tunable chromatic dispersion compensation device comprises a chromatic dispersion compensator, and a controller. The chromatic dispersion compensator comprises at least a first chromatic dispersion compensation unit and a second chromatic dispersion compensation unit connected with the first chromatic dispersion compensation unit in series. The first chromatic dispersion compensation unit has a free spectral range, the second chromatic dispersion compensation unit has a free spectral range same as to that of the first chromatic dispersion compensation unit. Each chromatic dispersion compensation unit comprises an interference cavity. The controller comprises an inputting unit being configured for inputting a predetermined chromatic dispersion compensation information. The controller is configured for selectively adjusting refractive index of the interference cavity of a corresponding chromatic dispersion compensation unit so as to control chromatic dispersion. A tunable chromatic dispersion compensation is also provided.
1. A tunable chromatic dispersion compensation device, comprising:
a collimator, the collimator comprising a twin-core fiber and a lens, the twin-core fiber and the lens being disposed facing to each other;
an interference cavity, the interference cavity being connected with the collimator;
a heating unit, the heating unit disposed at the interference cavity and being configured for heating the interference cavity so as to change a refractive index of the interference cavity;
wherein the interference cavity comprises a first reflection surface and a second reflection surface, the first t reflection surface and the second reflection surface are coated with reflecting coating; and
wherein the tunable chromatic dispersion compensation device further comprising a second glass tube, wherein the lens is received in the second glass tube, the second glass tube comprises a first connecting end facing to the twin-fiber and a second connecting end opposite to the first connecting end.
2. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the interference cavity is made of silicon material.
3. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the heating unit comprises a thermistor and a heating resistor, the thermistor is disposed in a middle of the heating resistor and is configured for sensing temperature of the interference cavity.
4. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the heating unit comprises an inductor loop and a heating loop, the inductor loop is thermistor, the heating loop is a heating resistor, the thermistor is disposed at an inner of the heating loop.
5. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the heating unit comprises induction layer, an insulating layer and a heating layer, which is stacked in that order, the induction layer is connected with the interference cavity and is configured for sensing temperature of the interference cavity.
6. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the reflecting coating on the first reflection surface is partial reflection coating.
7. According to the tunable chromatic dispersion compensation device in claim 1 , wherein the reflecting coating on the second reflection surface is total reflection coating.
8. According to the tunable chromatic dispersion compensation device in claim 1 , further comprising a first glass tube, wherein the twin-fiber comprises an input terminal and an output terminal, distal ends of the input terminal and the output terminal are fixed in the first glass tube such that the distal ends of the input terminal and the output terminal always be maintained parallel to each other.
9. According to the tunable chromatic dispersion compensation device in claim 8 , wherein the second connecting end connects with first reflection surface of the interference cavity, the heating unit is disposed at the second reflection surface.