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Optical pulse time spreader

A time-diffusion, optical pulse technology, applied in lasers, laser parts, instruments, etc., can solve the problem of chip pulse intensity weakening

Inactive Publication Date: 2007-10-24
OKI ELECTRIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, when the phase of the chip pulse generated by one reflection and the phase of the chip pulse output by three reflections have an antiphase relationship, the sum obtained as the two is obtained from The intensity of the chip pulse output by SSFBG is weakened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0184] The configuration of the SSFBG 40 as the phase control means of the optical pulse time spreader of the first embodiment will be described with reference to FIGS. 8(A), (B) and (C). 8(A) is a schematic cross-sectional view of the SSFBG 40, which is configured to arrange 15 unit FBGs in series along the optical waveguide of the optical fiber 46, that is, the wave guiding direction of the core 44, at the center of the optical fiber 46 having the core 44 and the cladding 42. Core 44 on.

[0185]FIG. 8(B) is a diagram schematically showing the refractive index modulation structure of the SSFBG 40 shown in FIG. 8(A) . The horizontal axis of Fig. 8 (B) represents the positional coordinate of the longitudinal direction of the optical fiber, and the vertical axis is the effective refractive index n of the optical fiber eff The center represents the refractive index modulation size Δn. In other respects, FIGS. 8(A), (B) and (C) are represented using the same method as FIGS. 2(A...

no. 2 Embodiment

[0196] 12(A), (B) and (C), the structure of the SSFBG 50 as the phase control means of the optical pulse time spreader of the second embodiment will be described. 12(A) is a schematic cross-sectional view of the SSFBG 50, which is configured such that 15 unit FBGs are arranged in series on the core of the optical fiber 56 having the core 54 and the cladding 52 along the optical waveguide of the optical fiber 56, that is, the wave guiding direction of the core 54. within 54. Since only the refractive index modulation structure of the SSFBG 50 is different, and other parts are the same as those of the SSFBG 40 of the first embodiment, repeated description thereof will be omitted. The optical phase code set in the SSFBG 50 of the second embodiment is also the same as the optical phase code set in the SSFBG 40 of the first embodiment. In other respects, Figs. 12(A), (B) and (C) are expressed in the same way as Figs. 2(A), (B) and (C).

[0197] The difference between the refracti...

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Abstract

The invention provides an optical pulse time diffuser which can generate chip pulse strings with consistent intensity. Reflectivity of the FBG in the first, the second and the kth (k is an integer not larger than J and not smaller than 3) unit R1, R2 and Rk are respectively given by following formulas: formula (a): R1 is equal to Pc (Pc is a constant); formula (b): R2 is equal to Pc / (1-R1)<2>; formula (c-1): Rk is equal to (Pc<1 / 2>-Pk<1 / 2>) / ((1-R1<2>).(1-R2) <2>...(1-Rk-1) <2>); formula (c-2): Rk is equal to (Pc <1 / 2>added with Pk<1 / 2>) / ((1-R1) <2>.(1-R2) <2>...(1-Rk-1) <2>); wherein, Pc is an arbitrary constant, Pk is the intensity of the chip pulse during three reflections that are output in the kth order, and formulas (c-1) and (c-2) are the reflectivity of the diffraction grating in the kth unit under the situation that the phase difference between the chip pulse during one reflection that is output in the kth order and the chip pulse during three reflections that are output in the kth order are respectively 0 and Pi.

Description

technical field [0001] The present invention relates to an optical pulse time diffuser used as an encoder or a decoder in an optical code division multiplexing (OCDM: Optical Code Division Multiplexing) communication system, in particular to connecting a unit diffraction grating in series along the guiding direction of an optical waveguide Configuration of the optical pulse time scatterer. Background technique [0002] In recent years, the demand for communication such as the spread of the Internet has increased rapidly. Correspondingly, a high-speed and large-capacity network using optical fiber is being constructed. Furthermore, in order to increase the capacity of communication, people are studying the optical multiplexing technology that collectively transmits optical pulse signals of multiple channels on one optical fiber transmission path. [0003] As one of the optical multiplexing technologies, OCDM is studied. OCDM has flexibility in use, that is, it has the feat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/00H04B10/02G02B6/02H01S3/10
CPCG02B6/02085G02B6/29392G02B6/2932H04J14/005
Inventor 佐佐木健介小林秀幸
Owner OKI ELECTRIC IND CO LTD