CN1828370A - Optical fiber signal modulator based on echo interference effect - Google Patents
Optical fiber signal modulator based on echo interference effect Download PDFInfo
- Publication number
- CN1828370A CN1828370A CNA2006100133672A CN200610013367A CN1828370A CN 1828370 A CN1828370 A CN 1828370A CN A2006100133672 A CNA2006100133672 A CN A2006100133672A CN 200610013367 A CN200610013367 A CN 200610013367A CN 1828370 A CN1828370 A CN 1828370A
- Authority
- CN
- China
- Prior art keywords
- signal
- optical fiber
- fiber
- face
- interference effect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
Wherein, as the Fresnel Reflection on fiber end to generate echo, if there is reflecting medium on back of emission end and the distance between fiber end face and medium distance as wavelength level, generating multi-beam interference effect. Besides, using a photoelectric device to control the distance fiber end and reflecting medium; inputting the regulation signal into piezoelectric device; outputting opposite modulated light intensity signal. This invention has high modulation degree, simple technique, low cost, and special fit to full-light path.
Description
Affiliated technical field
The present invention relates to the modulator approach of transmitting optical signal in a kind of fibre system, belong to the optical signalling process field.
Background technology
Light modulation techniques is the important step during optical signalling is handled.Especially in recent years along with the fast development of global optical communication industry, constantly ripe and perfect.At present, backbone network has upgraded to optical-fiber network substantially in communication system, and branch's communication network still utilizes copper cash interconnected, so optical fiber is connected to the important topic that the family becomes next stage optical communication development.Modern fibre system is mainly used two class modulators, and a kind of is to depend on certain slab guide to carry the electrooptic modulator that the light mode changes, and another kind is the semiconductor diode electroabsorption modulator that inner structure is similar to laser instrument.Electrooptic modulator is mainly based on the linear electro-optic effect of piezoelectric crystal (as lithium columbate crystal); The electric absorption semiconductor modulator is a semiconductor diode that adds reverse biased.The electric absorption semiconductor modulator is the same with electrooptic modulator, is Polarization-Sensitive device; The digital transmission modulation rate of electrooptic modulator is higher, and the electric absorption semiconductor modulator then can be mutually integrated with light source.More than two class modulators be Polarization-Sensitive device, promptly the polarization state to light signal has the corresponding condition requirement.And price is generally relatively more expensive, the manufacture craft more complicated.
Fresnel reflection can take place at fiber end face and produce echo in the light signal that transmits in the optical fiber.Between a pair of butt joint fiber end face the multiple-beam interference effect can take place, make that echoed signal is relevant to be strengthened or disappear mutually, echoed signal intensity is with to dock the fiber end face spacing relevant.When fiber end face is cyclical variation, echoed signal also will be cyclical variation.The present invention has utilized this characteristics design a kind of optical fiber signal modulator based on the echo interference effect.This modulators modulate degree height, manufacture craft are simple, cheap, are fit to extensively promote.
Summary of the invention
The present invention has designed a kind of optical fiber signal modulator based on the echo interference effect.Fresnel reflection can take place at fiber end face and produce echo in the light signal that transmits in the optical fiber, and promptly fiber-optic signal is at the reflected light of fiber end face.When a pair of fiber alignment, if there is the gap in the end face of two-stage optical fiber up and down, be generally the clearance, two fiber end faces constitute similar Fabry one glass sieve chamber.Fresnel reflection all can take place at the end face of two-stage optical fiber in light signal, and the reflected light signal generation multiple beam equal inclination interference of the reflected light signal of next stage fiber end face and upper level fiber end face makes that echoed signal is relevant to be strengthened or disappear mutually.The input light intensity of upper level optical fiber is I
0, then the echo light intensity is: I
(r)=I
0[Fsin
2(δ/2)]/[1+Fsin
2(δ/2)], I wherein
0Be upper level optical fiber input light intensity, F=4R/ (1-R)
2, R is the reflectivity of fiber end face place light wave, δ=4 π λ
-1N0dcos θ.λ is a signal light wavelength, and θ is the ray refraction angle.When the d value makes sin
2(δ/2)=0, promptly (k is an integer to δ=2k π, i.e. k=1,2,3 ...) time, reflected light presents minimum value; Otherwise, when the d value makes sin
2(δ/2)=1, (k is an integer to the π of δ=(2k+1), i.e. k=1,2,3 ...) time, reflected light presents maximal value.As seen echoed signal intensity is relevant with butt joint fiber end face spacing, when two-stage fiber end face spacing changes, and I
(r)Change relevant the enhancing or coherent subtraction with spacing.When fiber end face is cyclical variation, echoed signal also will be cyclical variation.The present invention has utilized this characteristics design a kind of optical fiber signal modulator based on the echo interference effect.Next stage optical fiber can utilize the reflective medium of refractive index match to replace, and the refractive index and the optical fibre refractivity of reflective medium are close.
The technical solution used in the present invention is: with the reflective medium butt joint of optical fiber and coupling, and the initial separation that adjusting is fit to makes its spacing in transmitting optical signal operation wavelength magnitude.Between fiber end face, utilize piezoelectric device control spacing, and to the piezoelectric device input modulating signal, the corresponding variation takes place in the fiber end face spacing under the modulation signal effect, because echo interference effect, the corresponding change takes place with the variation of spacing in reflective light intensity, the optical fiber echoed signal will be exported the modulated light intensity signal corresponding with modulation signal, realize amplitude modulation(PAM) by gathering the optical fiber echoed signal.The signal of input is signals such as sine, pulse, switch, and the optical fiber echoed signal will be exported signals such as corresponding sine, pulse, switch.
The invention has the beneficial effects as follows, this modulator approach is primarily aimed at the signal amplitude modulation, can be applicable to amplitude modulation and the optical fiber source interchange or the pulse signal output of optical fiber transmission signal, and can directly be connected, be specially adapted to solve the optical modulation problem in the full optical fiber optical optical road with optical fiber.Modulators modulate degree height, manufacture craft are simple, cheap.
Description of drawings
The present invention is further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is based on the optical fiber signal modulator overall work principle schematic of echo interference effect.
1.Y type fiber coupler among the figure, the 2. reflective medium of refractive index match, 3. piezoelectric device 4. modulation signal input ports, 5. amplifier, 6. direct supply, 7. fiber coupler input end, 8. fiber coupler echo end, 9. fiber coupler output terminal, 10. micromatic setting.
Embodiment
In Fig. 1, regulate fiber coupler (1) output terminal (9) and refractive index match reflective medium (2) spacing by micromatic setting (10), its spacing is slightly approached, fiber-optic output face and reflective medium reflective surface constitute interference cavity.Laser is by fiber coupler input end (7) input, and the part light intensity is at fiber coupler output terminal (9) end face generation Fresnel reflection, and the part light intensity is by fiber coupler output terminal (9) transmission, and reflects through refractive index match reflective medium (2).Forming multiple-beam interference through repeatedly reflection and transmission optical fiber output end face and reflective medium reflective surface, will the be concerned with enhancing or decay of the echoed signal of fiber coupler echo end (8).By modulation signal input port (4) input modulating signal, amplify through amplifier (5), and be loaded into piezoelectric device (3) it is vibrated with modulation signal, fiber-optic output face and reflective medium reflective surface spacing change with the variation of modulation signal, the optical fiber echoed signal will be exported the modulated light intensity signal corresponding with modulation signal, realize amplitude modulation(PAM) by gathering the optical fiber echoed signal.The modulation effect of detection optical fiber echoed signal, if degree of modulation is not ideal enough, utilize direct supply (6) through amplification appliance (5) for piezoelectric device provides bias voltage, further regulate fiber-optic output face and reflective medium reflective surface spacing, improve degree of modulation.During in transmitting optical signal operation wavelength magnitude, degree of modulation will reach desirable effect in fiber end face and reflective medium spacing.It is to be noted that fiber end face need cut with the optical fiber cutter, so that fiber end face is smooth, so that can with strict parallel of reflective medium surface ratio, can guarantee that so desirable multiple-beam interference takes place light beam between fiber end face and reflective medium reflective surface.
Claims (1)
- A kind of optical fiber signal modulator based on the echo interference effect.It is characterized in that: utilize the light signal that transmits in the optical fiber at fiber end face because Fresnel reflection produces echo and multiple-beam interference effect, use fiber coupler and reflective medium.Distance is in wavelength magnitude between fiber end face and reflective medium, and the multiple-beam interference effect can take place light signal, makes that echoed signal is relevant to be strengthened or disappear mutually.Utilize piezoelectric device control fiber end face and reflective medium spacing, and to the piezoelectric device input modulating signal, spacing takes place to change synchronously under the modulation signal effect, and the optical fiber echoed signal will be exported the modulated light intensity signal corresponding with modulation signal, realizes the Modulation and Amplitude Modulation to light signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100133672A CN1828370A (en) | 2006-03-24 | 2006-03-24 | Optical fiber signal modulator based on echo interference effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100133672A CN1828370A (en) | 2006-03-24 | 2006-03-24 | Optical fiber signal modulator based on echo interference effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1828370A true CN1828370A (en) | 2006-09-06 |
Family
ID=36946842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100133672A Pending CN1828370A (en) | 2006-03-24 | 2006-03-24 | Optical fiber signal modulator based on echo interference effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1828370A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932070A (en) * | 2012-11-09 | 2013-02-13 | 北京交通大学 | Quick tunable phase shift keying signal demodulator |
| CN112713940A (en) * | 2020-12-28 | 2021-04-27 | 杭州电子科技大学 | Optical fiber array type retro-reflector and modulation method thereof |
-
2006
- 2006-03-24 CN CNA2006100133672A patent/CN1828370A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932070A (en) * | 2012-11-09 | 2013-02-13 | 北京交通大学 | Quick tunable phase shift keying signal demodulator |
| CN102932070B (en) * | 2012-11-09 | 2015-05-06 | 北京交通大学 | Quick tunable phase shift keying signal demodulator |
| CN112713940A (en) * | 2020-12-28 | 2021-04-27 | 杭州电子科技大学 | Optical fiber array type retro-reflector and modulation method thereof |
| CN112713940B (en) * | 2020-12-28 | 2022-01-11 | 杭州电子科技大学 | Optical fiber array type retro-reflector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8503838B2 (en) | Two-part optical coupling system having an air gap therein for reflecting light to provide optical feedback for monitoring optical output power levels in an optical transmitter (TX) | |
| US5259044A (en) | Mach-Zehnder optical modulator with monitoring function of output light | |
| JP5782974B2 (en) | Light modulator and light receiving amount adjustment method of light receiving element of light modulator | |
| CA2374168C (en) | Optical waveguide modulator with output light monitor | |
| CA2255450C (en) | Optical modulator using isolator and optical transmitter including the same | |
| JP2015194517A (en) | light modulator | |
| CN1360407A (en) | 3R optical signal reproduction | |
| JP3717605B2 (en) | Optical modulator module | |
| JP2744092B2 (en) | Laser equipment for optical communication equipment | |
| CN1828370A (en) | Optical fiber signal modulator based on echo interference effect | |
| CN103487899A (en) | Single-fiber bi-directional light receiving and emitting device | |
| CN101321021B (en) | Directly modulated optical differential phase keying modulator | |
| JP2787812B2 (en) | Reflective transmitting and receiving device for bidirectional optical waveguide communication system | |
| US7433550B2 (en) | Optical modulator and control method therefor | |
| JPH05134220A (en) | Optical transmitter | |
| WO2014022971A1 (en) | Externally modulated laser, passive optical communication apparatus and system | |
| CN115200618B (en) | All-optical phase modulation system based on gas photo-thermal effect in micro-nano optical fiber | |
| CN114993450A (en) | Low-loss low-power-consumption compact heterodyne acousto-optic modulation module | |
| CN1821834A (en) | Novel optical fiber signal modulator based on multiple light beam interference effect | |
| WO2004003600A2 (en) | Peripheral coupled traveling wave electro-absorption modulator | |
| CN103650386B (en) | A kind of device strengthening extinction ratio and optical sender, photoreceiver, optical module | |
| US10551714B2 (en) | Optical device | |
| CN1828369A (en) | Optical fiber signal modulator based on insertion loss | |
| CN221303741U (en) | High-linearity optical fiber acousto-optic modulator | |
| JPH05150200A (en) | Optical transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Tianhao Document name: Written notice of preliminary examination of application for patent for invention |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Tianhao Document name: Notification before expiration of term |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20060906 |