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Phase modulator and phase modulating method

A phase modulation and phase modulator technology, which is applied in safety communication devices, phase modulation carrier systems, transmission systems, etc., can solve problems such as high-speed obstacles and inability to function normally.

Inactive Publication Date: 2003-11-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If you ignore it and increase the repetition rate (such as the pulse laser), you cannot take the blank period BP (BP≤0), and the rise of the voltage in the next sequence overlaps with the drop in the voltage of the previous sequence, and cannot function normally.
Therefore, there is a problem that becomes an obstacle to speeding up

Method used

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  • Phase modulator and phase modulating method

Examples

Experimental program
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Embodiment 1

[0056] In Embodiment 1, a high-speed modulation method of phase modulation quantum cryptography is described, which is characterized in that, in the use of phase modulation quantum cryptography, a plurality of phase modulators are arranged in parallel and switched at high speed by an optical switch.

[0057] figure 1 A high-speed modulation system of quantum cryptography representing a phase modulation method.

[0058]This modulation system is composed of a transmission device 100 , a transmission path 200 and a reception device 300 . In the transmission device 100, the laser 91 oscillates the optical signal at the repetition frequency C to continuously generate the optical signal. The first coupler 94 and the second coupler 95 separate and combine optical signals. The first phase modulator 71 and the second phase modulator 73 perform phase modulation on the optical signal. The first optical switch 33 and the second optical switch 35 switch the first phase modulator 71 and...

Embodiment 2

[0070] Figure 4 is a diagram showing another example of the transmitting device 100 (or the receiving device 300).

[0071] exist Figure 4 , indicating that the four phase modulators of the first phase modulator 71, the second phase modulator 73, the third phase modulator 75, and the fourth phase modulator 77 are connected in parallel to use the first optical switch 33 and the second optical switch 35 Switching situation. The voltage generator 58 always generates 0V, 4V, 8V, and 12V in order to perform phase modulation of four quantities of 0, π / 2, π, and 3π / 2. 0V is supplied to the first phase modulator 71 . 4V is supplied to the second phase modulator 73 . 8V is supplied to the third phase modulator 75 . 12V is supplied to the fourth phase modulator 77 .

[0072] Figure 5 It is an operation explanatory diagram of the first phase modulator 71 , the second phase modulator 73 , the third phase modulator 75 , and the fourth phase modulator 77 . The first phase modulator ...

Embodiment 3

[0078] In the present embodiment 3, a high-speed modulation method of quantum cryptography using a phase modulation method is described. It is characterized in that in the quantum cryptography method using a phase modulation method, a plurality of phase modulators are arranged in series, and the phase to be modulated is divided. adjusted afterwards.

[0079] In this embodiment, another example of the transmitting device 100 (or the receiving device 300) is described.

[0080] In this example, using Figure 7 Describe the case where phase modulators are connected in series.

[0081] exist Figure 7 Among them, the first phase modulator 71, the second phase modulator 73, the third phase modulator 75, and the fourth phase modulator 77 are connected in series. The voltage generator 56 generates equal voltages and supplies them to these four phase modulators at the same time.

[0082] Figure 8 is the operating voltage of the 4 phase modulators.

[0083] Figure 9 is a volta...

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Abstract

In case of the high-speed operation, it is difficult to ignore the time required for the voltage to rise to the level of voltage to be applied and the time to fall to 0V when the voltage is applied to the phase modulator. The first phase modulator 71 and the second phase modulator 73 are connected in parallel, and the optical path is switched by the switching unit 55 of the control unit 51 between the first optical switch 33 and the second optical switch 35. The switching unit 55 of the control unit 51 supplies the phase modulation data 31 stored in the phase modulation data memory 53 to the first voltage generating unit 57 or the second voltage generating unit 59 to generate the voltage necessary for the phase modulation.

Description

technical field [0001] The present invention relates to a phase modulation device and method for high-speed phase modulation of an optical signal. For example, it relates to a high-speed modulation device and method used in phase modulation quantum cryptography. Background technique [0002] Figure 14 , 15 Indicates, for example, a phase modulation method used in conventional quantum cryptography disclosed in Uchiyama [Fundamentals of Quantum Mechanics and Quantum Cryptography] Mathematical Sciences No. 402, December 1996. [0003] In phase modulation ciphers, generally Figure 14 The configuration shown configures a phase modulator (PM). A phase modulator (PMA, PMB) is respectively arranged in the transmitting device and the receiving device, and a voltage corresponding to the phase modulation (0, π / 2, π, 3π / 2) is applied to the phase modulator. [0004] The quantum cryptography of the phase modulation method uses an optical system such as an optical fiber, and utilizes...

Claims

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Application Information

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IPC IPC(8): G02F1/01H04B10/00H04B10/548H04B10/564H04B10/70H04L9/38H04L27/20
CPCH04B10/5053H04B10/548H04B10/505H04L9/0858H04B10/5051
Inventor 长谷川俊夫西冈毅石塚裕一
Owner MITSUBISHI ELECTRIC CORP
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