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Birefingent cascade polarized interference old-even signal separator and its preparation method

A technology of signal splitter and polarization beam splitter, which is applied in the direction of wavelength division multiplexing system and optical waveguide coupling, and can solve the problems of complicated calculation method and difficult manufacture

Inactive Publication Date: 2002-09-04
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

In addition, the high-order wave plate is used, which is difficult to manufacture
[0006] What is described in the prior art [4] (see Journal of the Optical Society of American., S.E.Harris et al., 54(10), 1267-1279, 1964) is to generate specific filter spectral waveforms for cascaded birefringent filters The required filter structure needs to be obtained by the reverse calculation method. Although this reverse method is theoretically universal, it requires that the crystals used to form the cascaded birefringent filter must have the same thickness. Therefore, When simulating spectral waveforms with high-order cosine series, more crystals need to be used, and the calculation method is complicated

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  • Birefingent cascade polarized interference old-even signal separator and its preparation method
  • Birefingent cascade polarized interference old-even signal separator and its preparation method

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Embodiment Construction

[0062] Such as figure 1 The structure shown is implemented as an odd-even wavelength division signal splitter for splitting the odd-even number of a WDM signal with an input signal of 50 GHz spectral frequency interval into 100 GHz spectral frequency interval, and is used for the λ=1550nm band.

[0063] 1. Prepare the analog wave plate according to the above-mentioned specific methods

[0064] The specific method is as above.

[0065] When determining the opening ratio of the parity separator to produce a flat passband to the period is the spectral transmission function of the periodic flat passband and stopband of 2:1, obtained by the formula (20) in the first step above is that the Fourier series of the ideal periodic rectangular function has only odd frequency items, which is T ( f ) = 0.5 + 2 π cos ( 2 ...

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Abstract

An odd and even number signal separator of double refraction polarization interference which is mainly used in two channels separating of odd and even number signal in wavelength division multiplexing signal of communication system and filter required for flattening spectral transmission factor function includes that the core element is the filter formed by K (is grealer than or equal to 1 ) numbers of analog wave plate with the same structures. The double refraction delay and polarization orientation can make the progression of spectral transmissino factor function near Furier series of ideal cycle retangle transmission factor function. The separator can be prepared by applying comparative and search method of Furier series to obtain matching combination angle of K numbers of analog polarization rotary plate in K numbers of analog wave plate which is the most near cycle retangle transmission factor function. The invented separator can realize the odd-even separation of waven branch signal in various big or small intervals of spectral frequency so as to reduce the quantity of analog wave plates in the filter.

Description

Technical field: [0001] The present invention is a birefringent cascaded polarization interference odd-even number signal separator and its preparation method. The signal separator is mainly used for two-channel separation of odd-numbered and even-numbered signals in wavelength division multiplexing signals in wavelength division multiplexing communication systems. (English name interleaver), can also be used for all filters that need to flatten the spectral transmittance function. Background technique: [0002] The wavelength division multiplexing signal is composed of a series of single carrier frequency signals with equal frequency intervals, and the wavelength division multiplexing signal can be separated according to different wavelengths by using a demultiplexer. With the development of dense wavelength division multiplexing technology, the frequency interval is getting smaller and smaller, which puts forward higher spectral resolution requirements for the demultiplexe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/24H04J14/02
Inventor 刘立人张娟周煜周常河刘德安
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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