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Optical modulating circuit and optical modulating method

一种光调制、电路的技术，应用在光多路复用系统、光学、电气元件等方向，能够解决数据率频带限制等问题

Inactive Publication Date: 2007-06-20
OKI ELECTRIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the data rate is limited by the frequency band of the circuit components

Method used

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  • Optical modulating circuit and optical modulating method
  • Optical modulating circuit and optical modulating method
  • Optical modulating circuit and optical modulating method

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no. 1 Embodiment approach

[0066] An optical modulation circuit and an optical modulation method according to a first embodiment will be described with reference to FIGS. 1 and 2 . FIG. 1 is a schematic configuration diagram illustrating an optical modulation circuit according to a first embodiment. FIG. 2 is a timing chart for explaining the operating principle of the optical modulation circuit. In FIG. 2, the horizontal axis represents time. In addition, on the vertical axis, the magnitude of each signal is represented by voltage for electrical signals, and light intensity for optical signals. In Figure 2, the reference position on the time axis is equal to the data period T bit time interval, from 0, T bit , 2T bit 、3T bit 、4T bit , 5T bit and 6T bit express.

[0067] The optical modulation circuit 10 is configured to include a first light source 15 - 1 , a second light source 15 - 2 , an optical switch 30 , an optical modulator 50 , and a delay unit 60 .

[0068] The first light source 15 ...

no. 2 Embodiment approach

[0113] An optical modulation circuit and an optical modulation method according to the second embodiment will be described with reference to FIGS. 6 and 7 . FIG. 6 is a schematic configuration diagram illustrating an optical modulation circuit according to a second embodiment. FIG. 7 is a timing chart for explaining the operating principle of the optical modulation circuit. In FIG. 7, the horizontal axis represents time. Also, the vertical axis represents the magnitude of each signal, and electrical signals are represented by voltage, while optical signals are represented by light intensity.

[0114] In the optical modulation circuit and the optical modulation method of the second embodiment, in one data cycle T 2bits The modulation method used in the case of transmitting 2-bit information within 4(=2 2 ) value pulse position modulation.

[0115] The optical modulation circuit 11 is configured to include first to fourth light sources 15 - 1 to 4 , an optical switch unit 70...

no. 3 Embodiment approach

[0142] An optical modulation circuit and an optical modulation method according to a third embodiment will be described with reference to FIG. 10 . FIG. 10 is a schematic configuration diagram for explaining an optical modulation circuit according to a third embodiment.

[0143] In the optical modulation circuit and optical modulation method of the third embodiment, one data period T nbits The modulation method used in the case of transmitting n-bit information within a 2 n Pulse position modulation of the value.

[0144] The optical modulation circuit 12 is configured to include: first to second n Light source 15-1~2 n , the optical switch unit 170 , the optical modulator 50 and the delay unit 161 . In addition, since the optical modulator 50 may have the same configuration as that described in the first embodiment, description thereof will be omitted here.

[0145] 1st to 2nd n Light source 15-1~2 n For example, it is composed of any appropriate conventionally known s...

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PUM

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Abstract

The invention provides an optical modulating circuit and an optical modulating method. An optical modulating circuit realizing a PPM is constituted by circuit parts having a frequency band equal to a data rate to provide a technique which increase the data rate. A first light source generates a first single wavelength signal serving as a continuous light having a first wavelength lambda 1 as a wavelength of a carrier wave. A second light source generates a second single wavelength signal serving as a continuous light having a second wavelength lambda 2 different from lambda 1 as a wavelength of a carrier wave. For the first single wavelength signal and the second single wavelength signal, according to a transmission electric signal having information 0 or 1, an optical switch outputs a first single wavelength signal as an input optical signal when the information is 0. On the other hand, when the information is 1, the optical switch outputs the second single wavelength signal as an input optical signal. An optical modulator generates an optical pulse signal obtained by arranging optical pulses having lambda 1 or lambda 2 as a wavelength of a carrier wave at predetermined time intervals from the input optical signal. A delaying unit delays the optical pulse having the wavelength lambda 1 and the optical pulse having the wavelength lambda 2 by different delay time Deltat to obtain a PPM signal.

Description

technical field [0001] The invention relates to a light modulation circuit and a light modulation method for pulse position modulation. Background technique [0002] Pulse Position Modulation (PPM: Pulse Position Modulation) is a modulation in which the pulse signal corresponds to the digital information "0" and "1" relative to the reference position on the time axis specified by a clock signal of a certain frequency. method. [0003] A conventional PPM-based modulation circuit and modulation method will be described with reference to FIGS. 13 and 14 (see, for example, Non-Patent Document 1). FIG. 13 is a schematic configuration diagram of a conventional modulation circuit. FIG. 14 is a timing chart for explaining the operating principle of the modulation circuit in the conventional example shown in FIG. 13 . The timing chart of FIG. 14 is represented by time on the horizontal axis and voltage of each signal on the vertical axis. In Figure 14, the reference position on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/04G02F1/00H04B10/516H04B10/524H04B10/58H04B10/61H04J14/00H04J14/02
CPCH04J14/02H04J14/08
Inventor 凑直树
Owner OKI ELECTRIC IND CO LTD
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