CN103138843A - Multi-channel light emitting device and light emitting method - Google Patents
Multi-channel light emitting device and light emitting method Download PDFInfo
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- CN103138843A CN103138843A CN2011103781502A CN201110378150A CN103138843A CN 103138843 A CN103138843 A CN 103138843A CN 2011103781502 A CN2011103781502 A CN 2011103781502A CN 201110378150 A CN201110378150 A CN 201110378150A CN 103138843 A CN103138843 A CN 103138843A
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- subcarrier
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Abstract
The invention provides a multi-channel light emitting device which comprises a light source, a modulator, a first optical spacer and at least one optical fiber. The modulator is used for modulating light wave emitted by the light source, and the modulated light wave comprises main carriers and auxiliary carriers. The first spacer is used for separating the main carriers and the auxiliary carriers, and the optical fiber only receives and transmits the auxiliary carriers. The invention further provides a light emitting method.
Description
Technical field
The present invention relates to the optical communication field, relate in particular to multi-channel optical emitter and light launching technique.
Background technology
Existing optical communication device, the main carrier that common only transmission light source sends is as carrier wave, and the filtering subcarrier, this kind structure is owing to having given up more wavelength, wish must adopt a plurality of light sources when improving channel number, therefore can't satisfy the consumption demand of low cost, small size.
Summary of the invention
In view of this, providing a kind of utilizes multi-channel optical emitter and the light launching technique that subcarrier carries out optical communication to be in fact necessity.
A kind of multi-channel optical emitter, it comprises a light source, a modulator, first photospacer, and at least one optical fiber.This modulator is used for the light wave that this light source sends is modulated, and the light wave after modulation comprises main carrier and subcarrier; This first photospacer is used for this main carrier is separated with subcarrier; This optical fiber only receives and transmits this subcarrier.
A kind of multi-channel optical emitter, it comprises: the light source that has fixed intervals between a plurality of centre wavelengths; A plurality of modulators that the light wave that is used for respectively these a plurality of light sources being sent is modulated, light wave after modulation comprises main carrier and subcarrier, one is used for the first photospacer that this main carrier is separated with subcarrier, and at least one only receives and transmit this subcarrier optical fiber.
A kind of smooth launching technique, it comprises the following steps: a light source is provided; Provide a modulator that the light wave that this light source sends is modulated, the light wave after modulation comprises main carrier and subcarrier; Provide first photospacer that this main carrier is separated with subcarrier; And provide at least one optical fiber only to receive and transmit this subcarrier.
With respect to prior art, multi-channel optical emitter provided by the invention and light launching technique are utilized modulating device and photospacer, use less light source can produce many channels, are therefore a kind of lower-cost light emitting devices and light launching technique.
Description of drawings
Fig. 1 is the schematic diagram of the multi-channel optical emitter that provides of first embodiment of the invention.
Fig. 2 is the spectrum schematic diagram of the multi-channel optical emitter of Fig. 1.
Fig. 3 is the schematic diagram of the multi-channel optical emitter that provides of second embodiment of the invention.
Fig. 4 is the schematic diagram of the multi-channel optical emitter that provides of third embodiment of the invention.
The main element symbol description
| The multi-channel |
100，110，200 |
| |
10 |
| |
101 |
| |
20 |
| The |
30 |
| The |
301 |
| The |
302 |
| |
40 |
| The second photospacer | 32 |
| |
321 |
| |
322 |
| |
50 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
See also Fig. 1 to Fig. 2, first embodiment of the invention provides a kind of multi-channel optical emitter 100, and it comprises 10, one modulators of a light source 20, one first photospacer 30(optical interleaver, OIL) and optical fiber 40.This light source 10, modulator 20, the first photospacer 30, this optical fiber 40 connect according to narrative order.
This light source 10 sends continuous light wave, for example laser.It is rear by these modulator 20 modulation that the light wave that this light source 10 sends enters this modulator 20, and modulation system can be phase-modulation (phase modulation), can be also other modulation systems such as frequency modulation(FM) (frequency modulation).
Distribute at leading edge, center and trailing edge due to the energy of light wave and be not quite similar, therefore refractive index changes after modulator 20 modulation, refraction index changing causes phase change, phase change and then cause frequency shift, cause frequency shift (FS), producing similar spectrum shown in Figure 2 consists of, namely this modulator 20 can make by the mode of frequency modulation or phase modulation the Energy distribution of this light source 10 change, thereby have centre wavelength and time wavelength that obviously can separate, centre wavelength and time light wave corresponding to wavelength all contain modulating signal.In its all inferior wavelength, can select the higher inferior wavelength of 2-4 energy as subcarrier.
Therefore photospacer (optical interleaver, OL or OIL) utilizes principle of interference to form constructive or destruction interference for certain wavelength interval, can be used for filtering out specific wavelength.The output of photospacer generally is divided into odd number output (odd channels/odd ports) and even number output (even channels/even ports).
As an example, an included laser diode 101 of this light source 10 sends the light wave that centre wavelength is 1510nm, and the optical wavelength range after modulation is between 1505-1515nm, and centre wavelength is 1510nm, and both sides are time wavelength.The odd number output is set as main carrier output 301, and the even number output is as subcarrier output 302.According to the difference of photospacer, also main carrier can be arranged to from 302 outputs of even number output.Main carrier finally can output to makes other purposes in other optical fiber, also can not export, as long as there is optical fiber 40 to receive and transmitting subcarrier.
in the present embodiment, subcarrier this main carrier relatively is symmetric aspect intensity, what energy equated is considered as one group, in all subcarriers, the luminous intensity of each two subcarriers of left and right of close main carrier is better, therefore transmit totally 4 wavelength in the left and right that can choose the most close main carrier, namely, these 4 wavelength can be exported from the even number output 302 of this first photospacer 30, two light sources of signal needs that are equivalent to the 100GHz of needs generation originally, can utilize now the signal of every group of transmission 50GHz of 2 groups of wavelength to realize, quantitative requirement to light source reduces, the cost of light emitting devices.Fig. 1 only with a subcarrier output 302 as example, reality can comprise a plurality of subcarrier outputs 302 as required, the all corresponding optical fiber 40 of each subcarrier output 302 perhaps is combined in an optical fiber by optical multiplexer (optical multiplexer 50 as shown in Figure 4).
According to the power of light intensity, can select each of the left and right of close main carrier or the wavelength of each three or more quantity of left and right to transmit, the number of wavelengths of suitable propagation is more, and channel is more, and transmission capacity is higher.
See also Fig. 3, in order further to increase transmission channel, can also continue to increase channel the wavelength between 1505nm-1515nm, can realize by increasing number of light sources.For example, the light source 10 of the multichannel emitter 110 that second embodiment of the invention provides comprises altogether three laser diodes 101, except a laser diode 101 sends the light wave that the main carrier wavelength is 1510nm, also have two laser diodes 101 to send respectively the light wave that the main carrier wavelength is 1535nm and 1560nm, the corresponding modulator of each light source.Simultaneously, this first photospacer 30 comprises altogether 3 main carrier outputs 301 and 3 subcarrier outputs 302, these three subcarrier outputs 302 are exported respectively 1～2 group subcarrier corresponding to wavelength of about centre wavelength 1510nm after modulation, 1～2 group subcarrier corresponding to wavelength about the centre wavelength 1535nm after modulation, and 1～2 group subcarrier corresponding to wavelength about the centre wavelength 1560nm after modulation, amount to three groups of subcarriers.
There are fixed intervals between the centre wavelength of above-mentioned three LASER Light Source, be 25nm, in this case, first photospacer 30 can be coupled with these a plurality of light source light, as long as the 25nm that is set to the first photospacer 30, can be in a spacer main carrier of multi beam light wave be separated with subcarrier, this situation also is applicable to the situation of two light sources, and the interval wavelength of the first photospacer 30 is arranged at the interval that is about to the centre wavelength of two light sources.
In other comprises embodiment more than two LASER Light Source, the centre wavelength of the individual LASER Light Source of N (N for greater than 2 integer) is unequal and do not exist in the situation of equal intervals mutually, can correspondingly use N the first photospacer 30, respectively main carrier be separated with subcarrier.Then all subcarriers are further processed or directly transmission.
These three subcarrier outputs 302 can be coupled with an optical fiber 40 respectively, namely utilize three optical fiber 40 to transmit respectively above-mentioned three groups of subcarriers, perhaps by an optical multiplexer (optical multiplexer), all sub carrier groups are synthesized one road light signal transmission, only get final product with an optical fiber 40.
see also Fig. 4, the multi-channel optical emitter 200 that third embodiment of the invention provides can further include second photospacer 32 on the basis of the second embodiment, this second photospacer 32 and 302 optical coupling of subcarrier output, be used for again filtering out at subcarrier the light wave that is fit to transmission, for example, suppose that above-mentioned three groups of subcarriers comprise that wavelength is 1508nm, 1512nm, 1533nm, 1537nm, 1558nm, the light wave of 1562nm, the 25nm that is set to the second photospacer 32, 1508nm, 1533nm, 1558nm exports from the odd number output, 1512nm, 1537nm, the 1562nm wavelength is exported from the even number output.Multi-channel optical emitter 200 can optionally transmit one or more subcarrier by odd number or the output of even number output as required.
The second photospacer 32 is porous input, porous output type structure or porous input, a hole output type structure.Under the previous case, the subcarrier output 302 of the first photospacer 30 and input 321 optical coupling of this second photospacer 32, then screened light wave is by output 322 outputs of this second photospacer 32, each output 322 can be distinguished corresponding optical fiber 40, also can with optical multiplexer 50 optical coupling, output one road light signal.Under latter event, screened light wave is all from an output output, so can directly transmission in an optical fiber 40.
Multi-channel optical emitter 200 provides the scheme of again screening a group wavelength or individual wavelengths, and, utilize the second photospacer 32 screenings filtering noise to a certain extent, avoid crosstalking between light wave, the signal of output disturbs less.
With respect to prior art, multi-channel optical emitter provided by the invention utilizes modulating device and photospacer, uses less light source can produce many channels, is therefore a kind of lower-cost light emitting devices.
Be understandable that, those skilled in the art also can do other variation in spirit of the present invention, within these variations all should be included in the present invention's scope required for protection.
Claims (13)
1. multi-channel optical emitter, it comprises:
A light source;
A modulator is used for the light wave that this light source sends is modulated, and the light wave after modulation comprises main carrier and subcarrier;
First photospacer is used for this main carrier is separated with this subcarrier; And
At least one optical fiber only receives and transmits this subcarrier.
2. multi-channel optical emitter as claimed in claim 1, it is characterized in that: this first photospacer has a plurality of subcarrier outputs, this at least one optical fiber only comprises an optical fiber, this multi-channel optical emitter further comprises an optical multiplexer that is connected with this first photospacer, and the sub carrier groups that this optical multiplexer is used for will a plurality of subcarrier outputs exporting is combined in this optical fiber and exports.
3. multi-channel optical emitter as claimed in claim 1, it is characterized in that: this first photospacer has a plurality of subcarrier outputs, and this at least one optical fiber comprises many optical fiber, and these many optical fiber are coupled respectively with these a plurality of subcarrier outputs.
4. multi-channel optical emitter as claimed in claim 1, it is characterized in that: this first photospacer only has a subcarrier output, and this at least one optical fiber only comprises an optical fiber, this optical fiber and the coupling of this subcarrier output.
5. multi-channel optical emitter as described in any one in claim 1-4, it is characterized in that: this multi-channel optical emitter further comprises second photospacer between this first photospacer and this at least one optical fiber, be used for filtering out the equally spaced subcarrier of a group at this subcarrier, this at least one optical fiber is used for the equally spaced subcarrier of this group of transmission.
6. multi-channel optical emitter as claimed in claim 5, it is characterized in that: this second photospacer has a plurality of subcarrier outputs, this at least one optical fiber only comprises an optical fiber, this multi-channel optical emitter further comprises an optical multiplexer that is connected with this second photospacer, and this optical multiplexer is used for should equally spaced sub carrier groups being combined in this optical fiber and exports.
7. multi-channel optical emitter as claimed in claim 5, it is characterized in that: this second photospacer has a plurality of subcarrier outputs, and this at least one optical fiber comprises many optical fiber, and these many optical fiber are coupled respectively with these a plurality of subcarrier outputs.
8. multi-channel optical emitter as claimed in claim 1, it is characterized in that: this main carrier is exported from this first photospacer or is not exported.
9. multi-channel optical emitter, it comprises:
There are fixed intervals in a plurality of light sources between the centre wavelength of these a plurality of light sources;
A plurality of modulators, the light wave that is used for respectively these a plurality of light sources being sent is modulated, and the light wave after modulation comprises main carrier and subcarrier;
First photospacer is used for this main carrier is separated with this subcarrier, and the interval wavelength of this first photospacer equates with these fixed intervals; And
At least one optical fiber only receives and transmits this subcarrier.
10. multi-channel optical emitter as claimed in claim 9, it is characterized in that: this multi-channel optical emitter further comprises second photospacer between this first photospacer and this at least one optical fiber, be used for filtering out the equally spaced subcarrier of a group at this subcarrier, this at least one optical fiber is used for the equally spaced subcarrier of this group of transmission.
11. multi-channel optical emitter as claimed in claim 10, it is characterized in that: this second photospacer has a plurality of subcarrier outputs, this at least one optical fiber only comprises an optical fiber, this multi-channel optical emitter further comprises an optical multiplexer that is connected with this second photospacer, and this optical multiplexer is used for should group equally spaced sub carrier groups being combined in this optical fiber and exports.
12. a light launching technique, it comprises the following steps:
At least one light source is provided;
Provide at least one modulator respectively the light wave that this at least one light source sends to be modulated, the light wave after modulation comprises main carrier and subcarrier;
Provide at least one first photospacer that this main carrier is separated with this subcarrier; And
Provide at least one optical fiber only to receive and transmit this subcarrier.
13. smooth launching technique as claimed in claim 12, it is characterized in that: the method is further comprising the steps: second photospacer between this first photospacer and this at least one optical fiber is provided, this second photospacer filters out the equally spaced subcarrier of a group in this subcarrier, the equally spaced subcarrier of this group of this at least one Optical Fiber Transmission.
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| CN201110378150.2A CN103138843B (en) | 2011-11-24 | 2011-11-24 | Multi-channel optical emitter and light launching technique |
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| CN201110378150.2A CN103138843B (en) | 2011-11-24 | 2011-11-24 | Multi-channel optical emitter and light launching technique |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050036785A1 (en) * | 2001-12-21 | 2005-02-17 | Ari Tervonen | Optical transmission network |
| US20070116468A1 (en) * | 2005-10-18 | 2007-05-24 | Nec Laboratories America | Optical tunable asymmetric interleaver and upgrade for dense wavelength division multiplexed networks |
| US20080131120A1 (en) * | 2006-12-05 | 2008-06-05 | Nec Laboratories America, Inc. | Wavelength division multiplexing passive optical network architecture with source-free optical network units |
| US20080253768A1 (en) * | 2007-04-12 | 2008-10-16 | Nec Laboratories America, Inc. | High Bit Rate Packet Generation with High Spectral Efficiency in an Optical Network |
| CN101692627A (en) * | 2009-10-15 | 2010-04-07 | 复旦大学 | System for generating optical cable-carried terahertz signal based on two-stage single-side band modulation |
-
2011
- 2011-11-24 CN CN201110378150.2A patent/CN103138843B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050036785A1 (en) * | 2001-12-21 | 2005-02-17 | Ari Tervonen | Optical transmission network |
| US20070116468A1 (en) * | 2005-10-18 | 2007-05-24 | Nec Laboratories America | Optical tunable asymmetric interleaver and upgrade for dense wavelength division multiplexed networks |
| US20080131120A1 (en) * | 2006-12-05 | 2008-06-05 | Nec Laboratories America, Inc. | Wavelength division multiplexing passive optical network architecture with source-free optical network units |
| US20080253768A1 (en) * | 2007-04-12 | 2008-10-16 | Nec Laboratories America, Inc. | High Bit Rate Packet Generation with High Spectral Efficiency in an Optical Network |
| CN101692627A (en) * | 2009-10-15 | 2010-04-07 | 复旦大学 | System for generating optical cable-carried terahertz signal based on two-stage single-side band modulation |
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