Wavelength option switch based on LCOS (Liquid Crystal On Silicon) and method for reducing port crosstalk
A wavelength selective switch and port technology, applied in the coupling of optical waveguide, light guide, optics, etc., can solve the problem of reducing crosstalk of wavelength selective switch
Active Publication Date: 2014-06-04
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to solve the problem of how to reduce the crosstalk between the ports of the wavelength selective switch
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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] Such as figure 1 As shown, the wavelength selective switch 100 provided by the present invention includes an optical fiber array 101, a cylindrical lens array 102 in the x direction, a first cylindrical lens 103 in the y direction, a polarization conversion unit 104, a second cylindrical lens 105 in the y direction, a cylindrical lens 106 in the x direction, Blazed grating 107 and LCOS (Liquid Crystal Display) 108 .
[0026] The working principle of the wavelength selective switch 100 is: the optical signal is input from the port 1 (for example) of the optical fiber array 101, and is input to the polarization conversion unit 104 after being shaped by the cylindrical lens array 102 in the x direction and the first cylindrical lens 103 in the y direction. The polarized light converted into the same polarization direction is incident on the blazed grating 107 af...
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The invention discloses a wavelength option switch based on LCOS (Liquid Crystal On Silicon) and a method for reducing port crosstalk. The method comprises the following steps of: calculating the deflection angles theta<1> to theta of all channel wavelength light signals after incidence to LCOS according to a sequential degressive mode of light signal power, and respectively calculating the difference values delta theta<21>-delta theta between other deflection angles theta<2> to theta and the minimal deflection angle theta<1>; making the distance d between optical fiber array ports and the focal length f of a second cylindrical lens in the y direction meet the following expression: f*tan(delta theta)=(2m+1)d / 2, wherein m is a positive integer larger than or equal to 0; or in the formula, delta theta is equal to delta theta<21>, and P refers to the number of ports of the wavelength option switches based on LCOS; and adjusting the phases of the LCOS region pixels corresponding to the wavelengths to output the light signal of the minimal deflection angle theta<1> to any appointed port of the optical fiber array. The method disclosed by the invention reduces the light signals of other wavelength reaching the output port as much as possible so as to reduce the port crosstalk.
Description
technical field [0001] The invention relates to a wavelength selective switch, in particular to an LCOS-based wavelength selective switch and a method for reducing crosstalk between ports. Background technique [0002] Wavelength division multiplexing is currently the most common optical layer networking technology. By multiplexing different wavelengths and transmitting them in one optical fiber, it is easy to achieve a transmission capacity of Gbit / s or even Tbit / s. However, the current wavelength division multiplexing system , which is essentially a point-to-point line system. In order to meet the operator's demand for improving network efficiency and flexibility, the construction of the basic bearer network will gradually adopt a flexible optical layer networking technology represented by reconfigurable optical add-drop multiplexing equipment, so that wavelength division multiplexing Simple point-to-point transition to ring and multi-ring intersecting topologies, and fin...
Claims
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IPC IPC(8): G02B6/293G02B6/35
Inventor 谢德权尤全刘子晨邱英周鹏
Owner WUHAN POST & TELECOMM RES INST CO LTD