CN200980079Y

CN200980079Y - A single-fiber and di-directional wavelength division multiplexing device

Info

Publication number: CN200980079Y
Application number: CN 200620041984
Authority: CN
Inventors: 陈谷红
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-23
Filing date: 2006-05-23
Publication date: 2007-11-21
Anticipated expiration: 2016-05-23

Abstract

The utility model relates to integrated optics technical field, which provides a single-fiber bidirectional wavelength-division multiplex device, based on plane wavelength-division multiplex technique and made from semi-conductor silicon plane technique. The utility model uses three-section mixed serial connection, and single-fiber bidirectional three-channel structure, and combines bidirectional data transmission method as ascending burst mode and descending continuous mode, to supply core technique to passive optical network (PON) which integrates wire television, voice and data, to improve the transmission efficiency of optical signal. The optical device provided by the utility model has compact structure, high integration, small volume, low weight, stable and reliable property, batch production support, high producing efficiency, low cost, and the application in fiber-to-home (FTTH) network system.

Description

The single-fiber-optic two-way wavelength division multiplexing device

Technical field

The utility model is a kind of single-fiber-optic two-way wavelength division multiplexing device, belongs to the integrated optics technique field.

Background technology

Network system that Fiber to the home at present (FTTH) is mixed main employing EPON (PON) mode at branch, and downstream signal adopts broadcast mode, is divided into identical multiple signals and passes to each Optical Network Terminal (ONU) respectively; Upstream data transmits and then adopts the time-division multipoint access technologies, and each Optical Network Terminal order in distributing to its time slot sends, and the optical branching device intensive data is unified to be passed to optical line terminal.There is the problem of two aspects in existing single-fiber-optic two-way wavelength division multiplexing device: at first, existing device generally all is a double-channel, if be used for the network system of fiber-to-the-home TV, voice-and-data " unification of three nets ", limitation is arranged technically, be difficult to realize truly " single fiber bi-directional ", " unification of three nets ".Secondly, existing device generally is to adopt traditional optical fiber sintering process to make, and the production technology difficulty is big, stability and reliability are not high enough, be not suitable for producing in enormous quantities, and integrated level is low, and loss ratio is bigger.

Summary of the invention

The purpose of this utility model provides a kind of 3 segmentations and mixes series connection, and the wavelength-division of single fiber bi-directional three channel architectures/separate wavelength division multiplexer is specially adapted to TV, voice-and-data " unification of three nets " Fiber to the home occasion.

Scheme of the present utility model is that the semiconductor processing technology of silica-based deposition of silica and the planar optical waveguide that technology is made are adopted in one of design, waveguide light core is deposited on the silicon-based wafer, and place refractive index and thickness all to be different from the silicon dioxide liner and the covering covering of light core, the refractive index of its liner and covering covering is slightly less than the refractive index of light core, and thickness then is three to five times of light core thickness; This slab guide light channel structure feature is: at leading portion separator, center coupler and the latter end separator of specific wavelength design form have separate, 3 segmentations of coupling, filter function mix the wavelength-division of series connection single fiber three channel architectures/separate wavelength division multiplexer.

The utility model has following advantage compared with the prior art:

1 owing to adopt the semiconductor processing technology of silica-based deposition of silica and technology to make, stability and integrity problem that device that traditional optical fiber sintering process makes exists have been overcome on production technology and device performance, the production efficiency and the performance of device have been improved, make device be fit to produce in enormous quantities, and volume is little, in light weight, the integrated level height, cost is low.

2 because design has adopted 3 segmentations to mix series connection, and single fiber bi-directional three channel architectures have overcome common single fiber bi-directional double-channel wavelength division multiplexer in the limitation that Fiber to the home uses, and have enlarged the range of application of device, have improved the operating efficiency of device.

Description of drawings

The utility model has following accompanying drawing:

Fig. 1 is the utility model planar optical waveguide cross section structure schematic diagram.

Fig. 2 is the structural representation that the utility model 3 segmentations mix series connection single-fiber-optic two-way wavelength division multiplexing device.

1. silicon-based wafers among the figure, 2. liner, 3. waveguide light core 4. covers covering, 5. Optical Fiber Transmission port, 6. wavelength 1310nm upgoing wave segment data transmission signals user port, 7. wavelength 1490nm downstream band data transfer signal user port, 8. wavelength 1550nm downstream band cable tv broadcast signal user port, 9. leading portion separator, 10. center coupler, 11. latter end separators.

Embodiment

Set forth embodiment of the present utility model below in conjunction with accompanying drawing:

The utility model is to adopt the semiconductor processing technology and the technology of silica-based deposition of silica to be made, shown in Fig. 1 planar optical waveguide cross section structure schematic diagram, by silicon-based wafer (1), liner (2), waveguide light core (3) and covering covering (4) constitute, its processing step is: 1 adopts chemical vapour deposition technique, on silicon-based wafer (1), and deposit liner (2) and waveguide light core (3); 2 utilize reactive ion etching technology to form designed slab guide light path; 3 on the basis of liner (2) and waveguide light core (3), and deposition of silica covers covering (4) again, after high annealing and HIGH PRESSURE TREATMENT, finishes the processing of wafer; The cutting of 4 wafers, the nude film polishing grinding is finished the encapsulation of chip at last.Wherein the refractive index of waveguide light core (3) earth silicon material is slightly larger than the refractive index of liner (2) and covering covering (4) earth silicon material, and the thickness of liner (2) and covering covering (4) is 3 to 5 times of waveguide light core (3) thickness, to guarantee that light signal transmits expeditiously in waveguide light core.The bidirectional data transfers of network system that Fiber to the home: descending with 1490nm wavelength continuous mode, up with 1310nm wavelength burst mode; The cable tv broadcast of system that Fiber to the home: downlink transfer 1550nm continuous mode.For the function of realize that Fiber to the home system's " single fiber bi-directional ", " unification of three nets ", the utility model design adopts a kind of 3 segmentations to mix series connection, the wavelength-division of single fiber three channel architectures/separate wavelength division multiplexer, as shown in Figure 2.Leading portion separator (9) is designed to the data transfer signal of separate wavelengths 1550nm downstream band, center coupler (10) is designed to the data transfer signal of the up wave band of coupled wavelength 1310nm, and latter end separator (11) is designed to the cable tv broadcast signal of separate wavelengths 1490nm downstream band.By the Optical Fiber Transmission port (5) of device,, in EPON, carry out transmitted in both directions by an optical fiber with all TV, voice-and-data signals that Fiber to the home need transmit; By the user port (6) of device, send wavelength 1310nm upgoing wave segment data transmission signals to network; By user port (7), receive the wavelength 1490nm downstream band data transfer signal of automatic network; Receive the wavelength 1550nm downstream band cable tv broadcast signal of automatic network by user port (8).These ports have been formed four inputs, the output bi-directional signal interface of single-fiber-optic two-way wavelength division multiplexing device.

Claims

1. single-fiber-optic two-way wavelength division multiplexing device, by silicon-based wafer, liner, waveguide light core and covering covering constitute, and it is characterized in that: on the silicon-based wafer, and deposition refractive index and the different silicon dioxide liner of thickness, waveguide light core and covering covering constitute planar optical waveguide device; Comprise that leading portion separator, center coupler, latter end separator form single fiber three channel architectures, use single integrated optical device, the signal of the three kinds of different channels of video display, voice, data of transmitted in both directions in an optical fiber and wavelength is coupled and separates.

2. by the described wavelength division multiplexer of claim 1, it is characterized in that: planar waveguide light core is to be deposited on the silicon-based wafer, and the liner and the covering covering that place refractive index and thickness all to be different from waveguide light core constitute planar optical waveguide device; The refractive index of its liner and covering covering is slightly less than the refractive index of waveguide light core; The thickness of liner and covering covering then is three to five times of waveguide light core thickness.

3. by the described wavelength division multiplexer of claim 1, it is characterized in that: have separation by forming at leading portion separator, center coupler, the latter end separator of specific wavelength, coupling, the wavelength-division of 3 segmentation series hybrid single fibers, three channel architectures of filter function/separate wavelength division multiplexer; The leading portion separator designs is a separate wavelengths 1550nm downstream band signal, and center coupler is designed to coupled wavelength 1310nm upgoing wave segment signal, and the latter end separator designs is a separate wavelengths 1490nm downstream band signal.

4. by the described wavelength division multiplexer of claim 1, it is characterized in that: by the Optical Fiber Transmission port, wavelength 1310nm upgoing wave segment signal user port, wavelength 1490nm downstream band signal user port, wavelength 1550nm downstream band signal user port are formed its four inputs, output bi-directional signal interface.