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Optical switch and optical waveform monitoring device utilizing optical switch

A monitoring device and optical switch technology, applied in the coupling of optical waveguides, optics, nonlinear optics, etc., can solve the problems of signal quality degradation, narrow wavelength range, reduced switching efficiency, etc., and achieve the effect of excellent optical S/N ratio.

Inactive Publication Date: 2006-03-29
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The above technique (3) does not have a limited operating speed because it does not use electrical signals, however, using high-speed signals exceeding 160Gbps causes problems such as 10-30dB loss associated with switching and a narrow range of wavelengths that can be switched
The reduction of switching efficiency leads to the reduction of optical S / N ratio and the deterioration of signal quality
Furthermore, narrow operating bandwidths require optical switches for individual signal wavelengths

Method used

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  • Optical switch and optical waveform monitoring device utilizing optical switch
  • Optical switch and optical waveform monitoring device utilizing optical switch
  • Optical switch and optical waveform monitoring device utilizing optical switch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0204] Figure 40 The structure used to test the characteristics of the optical switch of the present invention is shown. The test environment is described below.

[0205] Highly nonlinear fiber (HNLF) is equivalent to figure 1 The nonlinear fiber in 14. Its length is 20m, and the third-order nonlinear coefficient γ is 20.4W -1 km -1 , zero dispersion wavelength λ 0 1579nm, the dispersion slope is 0.03ps / nm 2 / km. The first mode-locked fiber laser (MLFL1) generates a series of pulses with a repetition rate of 10 GHz and a wavelength λs in the C-band. by LiNbO 3 Intensity modulator (LN, 10Gbps, PRBS: 2 23 -1) The series of optical pulses are modulated, and the modulated signals are multiplexed by optical time division multiplexing to generate a data signal Es of 160-640 Gbps. The data signal Es is input into the high nonlinear fiber HNLF together with the control pulse Ep generated by the second mode-locked fiber laser (MLFL2). The wavelength of the control pulse Ep ...

Embodiment 2

[0210] Experimental data for an optical demultiplexer that separates 10Gbps signals from 160Gbps, 320Gbps and 6406bps optical time division multiplexed signals Es is provided below. The pulse width of the 160Gbps signal Es is 1.6ps, the pulse width of the 320Gbps signal Es is 0.75ps, and the pulse width of the 640Gbps signal Es is 0.65ps. The pulse width of the control pulse Ep is 0.9 ps.

[0211] Figure 43 is the received power P of the separated signal R Graph of measured values ​​of BER (Bit Error Rate) when changes occur. The average power of the control pulses is +21.8dBm (equivalent to peak power = 15W). The average power of the 160Gbps input signal Es input to the optical switch is -5dBm.

[0212] At 160Gbps, the bit error rate was measured for each signal wavelength λs=1535nm, 1540nm, 1550nm, and 1560nm. As a result, error-free operation with a power loss of less than 0.2dB is achieved for all wavelengths within the C-band (BER=10 -9 ). For 320Gbps and 640Gbps ...

Embodiment 3

[0214] Shown is a signal waveform observed using an oscilloscope after sampling with the optical switch of the present invention. Figure 44A to Figure 44E The eye pattern observed under the same pulse width conditions as in Example 2 is shown. The sampling rate is 311MHz. Excellent eye patterns were obtained in the range of 160 to 640Gbps. This fine temporal resolution greatly facilitates light sampling with high contrast across the entire C-band range.

[0215] The following documents provide descriptions of Examples 1 to 3 above. S. Watanabe, et al. "Novel Fiber Kerr-Switch with Parametric Gain: Demonstration of Optical Demultiplexing and Sampling up to 640Gb / s", 30 th European Conference on Optical Communication (ECOC 2004), Stockholm, Sweden, September 2004, Post-deadline paper Th4.1.6, pp 12-13.

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Abstract

The polarization direction of an optical signal is changed by a polarization controller so as to be orthogonal to a main axis of a polarizer. A control pulse generator generates control pulses from control beam with a wavelength which is different from the wavelength of the optical signal. The optical signal and the control pulse are input to a nonlinear optical fiber. In the nonlinear optical fiber, the optical signal, during a time period in which the optical signal and the control pulse coincide, is amplified with optical parametric amplification around a polarization direction of the control pulse. The optical signal, during the time period in which the optical signal and the control pulse coincide, passes through the polarizer.

Description

technical field [0001] The present invention relates to the technique of extracting part of the optical signal, more specifically, to a method for extracting a time-division multiplexed optical signal with a series of optical pulses or signal components, to an optical switch using the method, and to an optical switch using the method Optical sampling oscilloscope of the optical switch. Background technique [0002] In recent years, the increase in the amount of data and the need for long-distance communication have contributed to the wide spread of devices and systems utilizing optical technology. An optical switch, which is a part of this technology that extracts a part of an optical signal consisting of a series of optical pulses, is being researched and developed as a core element. The following methods are known conventional techniques for switching an optical signal consisting of a series of optical pulses: [0003] (1) A technology that first converts a received opti...

Claims

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Application Information

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IPC IPC(8): G02F1/35H04B10/18H04B10/04G02B6/26
Inventor 渡边茂树
Owner FUJITSU LTD