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Optical analog/digital conversion method and apparatus thereof

A digital conversion and analog signal technology, applied in optical analog/digital converters, analog/digital conversion, optics, etc., can solve the problems of large-scale devices and difficult control, and achieve simple structure and easy optical analog/digital conversion processing Effect

Inactive Publication Date: 2011-03-30
OSAKA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the above-mentioned encoding, for example, when performing n-bit encoding, n encoders and n threshold processors must be provided, resulting in an increase in size of the device and difficulty in control.

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  • Optical analog/digital conversion method and apparatus thereof
  • Optical analog/digital conversion method and apparatus thereof
  • Optical analog/digital conversion method and apparatus thereof

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no. 1 Embodiment approach

[0056] figure 1 It is a block diagram showing a schematic configuration of the optical analog / digital conversion device according to the first embodiment of the present invention. The optical analog / digital conversion device 1 samples, codes, and quantizes an input optical analog signal Sin to output an optical digital signal Sout.

[0057] exist figure 1 Among them, the sampling signal generator 10 generates and outputs a signal of a predetermined frequency serving as a reference of the sampling signal to the optical sampling circuit 20 and the light source 30 . For the optical sampling circuit 20, the input wavelength λ that can be converted by optical analog / digital 2 The optical analog signal Sin of the optical analog signal Sin is output as an optical pulse train S11 sampled by the cycle of the sampling signal input from the sampling signal generator 10 . On the other hand, the output of the light source 30 has a predetermined wavelength λ 1 And it is a pulse train of...

no. 2 Embodiment approach

[0077] Next, a second embodiment of the present invention will be described. In this second embodiment, the above-mentioned optical encoder 60 and optical threshold processor 70 are realized using a Sagnac interferometer type optical switch.

[0078] Figure 10 It is a block diagram showing a schematic configuration of an optical analog / digital conversion device according to a second embodiment of the present invention. Such as Figure 10 As shown, the optical analog / digital conversion device 2 has an optical encoder 160 and an optical threshold processor 170 realized by a Sagnac interferometer-type optical switch. In addition, there is an optical amplifier 151 between the optical pulse branching delay multiplexer 40 and the optical encoder 160, and an optical amplifier 152 and an optical delay line ( Optical Delay Line; ODL) 153. Appropriate signal amplification is performed by the above-mentioned optical amplifiers 151 and 152 , and pulse timing adjustment is performed b...

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Abstract

A simple structure is used to achieve a high-rate optical analog / digital conversion. There are included an optical pulse branching / delaying / multiplexing unit (40), an optical encoder (60) and an optical threshold value processor (70). The unit (40) branches each of optical pulse sequences (S11), which is obtained by sampling an input optical analog signal (Sin), to generate the same number of replicas of optical pulses as a predetermined number of bits. The unit (40) then imparts a predetermined intensity difference and a predetermined time difference to each of the replicas of optical pulsesand multiplexes them to generate and output a sequence of temporally successive optical pulses. The combination of optical encoder (60) and optical threshold value processor (70) encodes and quantizes the optical pulse sequence (S12) to output an optical digital signal (Sout) corresponding to the optical analog signal (Sin).

Description

technical field [0001] The present invention relates to an optical analog / digital conversion method and its device for converting an optical analog signal into an optical digital signal, in particular to an optical analog / digital conversion method capable of performing high-speed optical analog / digital conversion with simple processing and structure. its device. Background technique [0002] Conventionally, analog / digital conversion processing has been realized by performing discretization, quantization, and encoding, and all of these discretization, quantization, and encoding processes are performed by electrical processing using semiconductors. [0003] In order to speed up the analog / digital conversion of light, in the discretization process, the method of separating the optical signal after time division multiplexed (time division multiplexed), that is, the method of four-wave mixing, or nonlinear loop mirror, or the method of using optical crystal can be applied. Metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F7/00
CPCH03M1/122G02F1/3519G02F7/00
Inventor 池田研介北山研一
Owner OSAKA UNIV