CN2840526Y

CN2840526Y - Reconfigurating optical add/drop multiplexing device

Info

Publication number: CN2840526Y
Application number: CN 200520046546
Authority: CN
Inventors: 刘浩峰; 曹建红; 朱增喜; 高义河
Original assignee: Shanghai B Star Co Ltd
Current assignee: Shanghai B Star Co Ltd
Priority date: 2005-11-15
Filing date: 2005-11-15
Publication date: 2006-11-22
Anticipated expiration: 2015-11-15

Abstract

The utility model relates to an electronic device which is used for optical fiber communication and has a light source, particularly a reconstructed optical add/drop multiplexing device. The utility model comprises a parallelogram prism, two refracting prisms and two filtering sheets, an incident optical signal passes through one refracting prism, two filtering sheets and the parallelogram prism and is output by the other refracting prism. Two refracting prisms are respectively used for carrying out multiplexing and demultiplexing for the optical signal with specific wavelength, and the utility model can complete the insertion and the separation with different wave lengths through a plurality of discrete OADM devices. Expansion is very flexible, and insertion loss is much shorter than the original art. The utility model saves a light switch in every one wavelength signal channel in the original art, simplifies wave separating and wave combining equipment and also saves cost.

Description

Reconfigurable OADM device

Technical field

The utility model relates to a kind of optical fiber communication optical active devices, is a kind of reconfigurable OADM device specifically.

Background technology

Optical add/drop multiplexer (OADM, Optical Add-Drop Multiplexer) is one of nucleus equipment of wavelength division multiplexing (WDM) All-Optical Communication Network, and it has material impact to the transmittability of all-optical network, networking mode, key characteristic etc.Its function is local reception and some wavelength channel of transmission up and down selectively from the transmission light path, does not influence the transmission of other wavelength channel simultaneously.That is to say that OADM has realized the function that traditional SDH (electric synchronous digital hierarchy) add-drop multiplexer is finished in time domain in the light territory, and have the transparency, can handle the signal of any form and speed.

General OADM system equipment is core with optical multiplying device and de-multiplying with device, array of photoswitch and network element monitoring administration module on the market now, can realize the add drop multiplex (as Fig. 1) of any wavelength.Its concrete course of work is as follows: the WDM signal that comes from circuit comprises a plurality of wavelength channels, the light demultiplexer end that enters OADM carries out demultiplexing, according to business demand, from a plurality of wavelength channels, utilize optical switch selectively from the required wavelength channel of following terminal (separation) output, correspondingly from the required wavelength channel of last terminal (insertion) input.And other with local irrelevant wavelength channel just directly by OADM and last wavelength-channels multiplexing together after, export after multiplexing through the line output of OADM again.Like this, when needs separate or insert any one road wavelength, wavelength all on the circuit need be carried out demultiplexing, and then carry out the switching of light path, after the switching, by optical multiplexer all wavelength be converged on the optical fiber again again.No matter insert and separate what wavelength, traditional OADM system has all brought loss to wavelength all on the optical fiber link, also causes uniformity to differ and very big insertion loss simultaneously.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of optical add/drop multiplexer that can adjust flexibly, reduces the wastage, to reach the purpose of high efficiency of transmission, add drop multiplex.

For solving the problems of the technologies described above, the utility model adopts following technical scheme: a kind of reconfigurable OADM device, comprise parallelogram prism, two refracting prisms and two filter plates, the light signal of incident is by refracting prisms, again by two filter plates and parallel quadrant prism, by another refracting prisms output.Described two refracting prisms are used for respectively a specific wavelength light signal is carried out multiplexing and demultiplexing.Described two filter plates are parallel to each other, and one is used to reflect the light that needs the wavelength that separates, its commplementary wave length of transmission, and another is used for transmission needs the multiplexing light that advances the wavelength of light path, reflects its commplementary wave length.Described parallelogram prism can move, and controls passing through of light path or reflects with the incision light path.

The utility model has been cast out original multiplex/demultiplex equipment, the insertion that can finish different wave length by discrete a plurality of OADM devices with separate, thereby make that expansion is very flexible.Only need the user to select device, just can insert at the wavelength of needs and separate, the light signal of other wavelength does not need processed, thereby has reduced loss.Also can not cause uniformity to differ, inserting loss also can be little more a lot of than original technology.

In addition, integrated level of the present utility model is also very high, the simultaneously integrated wave separater, the function of optical switch of closing.The volume of entire product can accomplish to have only the size of the optical switch of general 2x2, does not have the restriction of fiber reel around diameter, can directly be fixed on the circuit board.It saves the optical switch in each wavelength-channels in original technology, has greatly simplified the splitting/composing wave device, has saved cost greatly.

Description of drawings

Fig. 1 is the schematic diagram of at present general Optical Add/Drop Multiplexer.

Fig. 2 is schematic diagram of the present utility model (mode of operation).

Fig. 3 is schematic diagram of the present utility model (non-operating mode).

Fig. 4 is the structure chart when expanding to a plurality of device in concrete the enforcement.

Embodiment

Whole OADM can be divided into operating state and non operating state.OADM is in running order, and the refracting prisms of band filter plate are cut light path, finish the decomposition and the multiplexing function of signal.And when parallelogram prism incision light path, OADM is in non operating state, and at this moment it only makes signal pass through with remaining unchanged.

Concrete workflow is as follows:

During operating state, the two ways of optical signals input (supposes that it comprises four wavelength, is respectively λ ₁λ ₂λ ₃λ ₄) and insert (wavelength is λ), behind refracting prisms, light path becomes horizontal infection.As Fig. 2.Filter plate 1 and filter plate 2 are optical filter spares among the figure, are mainly used in selection and will go up/wavelength on following road, realize the wavelength route.Here input signal is after wave plate filtering after filtration, desired signal λ ₁From separating end output, and all the other wavelength X ₂λ ₃λ ₄Then all be reflected onto filter plate 2 places.Insert signal after filtration after the filtering of wave plate 2, want signal λ that adds and the λ that is reflected onto herein ₂λ ₃λ ₄Be output from output together.

When OADM was in non operating state, what remain unchanged behind the light signal input process parallelogram prismatic reflection exported from output.Insert signal and then all reflected, as shown in Figure 3 by the parallelogram prism.

Can expand by discrete a plurality of OADM devices, the insertion of having finished different wave length with separate.See Fig. 4.

The utility model has been cast out original multiplex/demultiplex equipment, the insertion that can finish different wave length by discrete a plurality of OADM combination of devices with separate, thereby make flexible expansion or reconstruct.Only need the user to select device, just can insert at the wavelength of needs and separate, the light signal of other wavelength does not need processedly, can not cause uniformity to differ yet, and inserting loss also can be little more a lot of than original technology.One or more OADM of increase that can be random expands the bandwidth on the circuit, original transmission system can not be affected simultaneously, not only can well carry out the dilatation of circuit, the user can also increase the wavelength signals at an edge overall optical link is carried out performance monitoring, uses to the user to bring great convenience.

Claims

1. reconfigurable OADM device, it is characterized in that: comprise parallelogram prism, two refracting prisms and two filter plates, the light signal of incident is by refracting prisms, again by two filter plates and parallel quadrant prism, by another refracting prisms output.

2. according to the described reconfigurable OADM device of claim 1, it is characterized in that: described two refracting prisms are used for respectively a specific wavelength light signal is carried out multiplexing and demultiplexing.

3. according to the described reconfigurable OADM device of claim 1, it is characterized in that: described two filter plates are parallel to each other, a light that is used to reflect the wavelength that needs separation, its commplementary wave length of transmission, another is used for transmission needs the multiplexing light that advances the wavelength of light path, reflects its commplementary wave length.

4. according to the described reconfigurable OADM device of claim 1, it is characterized in that: described parallelogram prism can move, and controls passing through of light path or reflects with the incision light path.