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Wavelength division multiplex transmission system

A transmission system, wavelength division multiplexing technology, applied in wavelength division multiplexing systems, coupling of optical waveguides, etc., can solve problems such as expensive, and achieve the effect of optimizing characteristics

Inactive Publication Date: 2013-11-20
KOREA ADVANCED INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The output wavelength of the distributed feedback laser diode (DFBLD) can be adjusted by temperature control, but the adjustable wavelength range is only about a few nanometers in the 1270-1600nm band (the low-loss wavelength band of ordinary silica-containing single-mode fiber)
[0013] Therefore, tunable wavelength light sources using external cavities have been mainly studied in the prior art, however, they are expensive and require complex equipment to tune the output wavelength

Method used

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Embodiment Construction

[0048] In the following, the structure and working principle of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0049] like figure 1 As shown, the tunable wavelength light source according to the present invention includes a broadband light source (BLS), a tunable bandpass filter (TBPF), an optical gyrator, and a Fabry-Perot laser diode.

[0050] Here, the broadband light source is any one of an incoherent light source (such as a fiber optical amplifier emitting amplified spontaneous emission, a semiconductor optical amplifier, a light emitting diode, and a superluminescent diode) or a coherent light source supercontinuum light source.

[0051] Ideally, a Fabry-Perot laser diode (FPLD) should not include an optical isolator for efficient light injection.

[0052] A tunable bandpass filter (TBPF) selectively passes the light to be injected.

[0053] A Fabry-Perot laser diode (FPLD) is a multimode light source ...

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Abstract

The invention relates to a wavelength division multiplex transmission system, comprising a wideband light source, an optical circulator, 2Nx1(de) multiplexer, two wavelength interleaver, N Fabry-Perotlaser diode, and N optical receiver, characterized in that the N Fabry-Perot laser diode are connected with odd-number ports of the (de) multiplexers, the N optical receiver are connected with even-number ports of the (de) multiplexers, common ports of the (de) multiplexers are connected with a first port of a first wavelength interleaver, a second port of the first wavelength interleaver is connected with a second port of the optical circulator, a first port of the optical circulator is connected with the wideband light source, a third port of the optical circulator is connected with a second port of the second wavelength interleaver, and a third port of the second wavelength interleaver is connected with a third port of the first wavelength interleaver.

Description

[0001] This application is a divisional application filed on April 29, 2005 with the application number: 2005100689918 and the title of the invention: "Tunable wavelength light source and wavelength division multiplexing transmission system using the light source". technical field [0002] The present invention relates to light sources providing wavelength selective output. More particularly, the present invention relates to a wavelength-tunable light source whose output wavelength can be controlled externally and a wavelength division multiplexing (WDM) transmission system using the light source. Background technique [0003] A light source providing output at a specific wavelength is one of the key components of a wavelength division multiplexing transmission system in which each channel is distinguished according to its wavelength. [0004] In order to minimize the interference between adjacent channels, the light source of the WDM transmission system should have a stable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/28H04J14/02
Inventor 李昌熙金显德
Owner KOREA ADVANCED INST OF SCI & TECH