NL2012906B1 - Ultra wide band suppressed carrier optical single side band signal generation. - Google Patents

Ultra wide band suppressed carrier optical single side band signal generation. Download PDF

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Publication number
NL2012906B1
NL2012906B1 NL2012906A NL2012906A NL2012906B1 NL 2012906 B1 NL2012906 B1 NL 2012906B1 NL 2012906 A NL2012906 A NL 2012906A NL 2012906 A NL2012906 A NL 2012906A NL 2012906 B1 NL2012906 B1 NL 2012906B1
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Netherlands
Prior art keywords
optical
signal
carrier
quadrature
splitter
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NL2012906A
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Dutch (nl)
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Simone Meijer Afric
Joan Van Der Zande Willem
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Stichting Katholieke Univ
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/02—Frequency-changing of light, e.g. by quantum counters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/32—Photonic crystals

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Optical beam generator, comprising a carrier beam input (1) and a signal beam input (2). A beam splitter (3) is connected to the carrier beam input (1) and the signal beam input (2) to obtain quadrature carrier beam components and quadrature signal beam components. First and second nonlinear photonic crystals (4, 5) are arranged to mix associated quadrature beam components of the quadrature carrier beam components and the quadrature signal beam components into optical double side band signals. A combiner element (6; 15) is arranged to receive the optical double side band signals and to provide an optical single side band signal using coherent addition or coherent subtraction.

Description

Ultra wide band suppressed carrier optical single side band signal generation Field of the invention
The present invention relates to an optical beam generator, comprising a carrier beam input and a signal beam input, for providing an optical single side band beam or signal.
Prior art
In analogue to electrical signals, optical single sideband (OSSB) modulation has been explored for increasing spectral efficiency and reducing power penalties, due to chromatic dispersion. As a single upper or lower sideband contains all information, suppressed carrier optical singles sideband (SC-OSSB) techniques are also exploited to reduce optical nonlinearities or increase gain in analog fiber optic links. Nowadays, many commercial companies and research institutes focus their research on OSSB and SC-OSSB modulation at terahertz frequencies. For instance, to increase the bandwidth of data communication and of use in an optical time-stretch analog-to-digital oscilloscope.
Most of the OSSB and SC-OSSB schemes are based on optically filtering, time delays as phase shifters in Sagnac and Mach-Zehnder interferometers, narrowband reflection from fiber Bragg gratings, and stimulated Brillouin scattering in fibers. Some of these techniques have shown to produce THz OSSB and SC-OSSB, but are complex, not flexible and not broadband. Therefore, they do not provide a general solution for OSSB and SC-OSSB modulation. The main-stream techniques for microwave OSSB and SC-OSSB systems use a combination of fiber optical elements, in conjunction with electrical driven electro-optical modulators, to generate high-quality OSSB up to 100 GHz. Based on planar lightwave circuits (PLC), these OSSB devices are robust, flexible and can handle broadband carriers over a wide range of frequencies, but are unable to produce electronically a signal in the terahertz frequency range.
Many of the prior art alternatives are limited to generate OSSB and SC-OSSB from narrow band electrical or optical signals, due to the use of time delays as phase shifters. Many of these limitations can be reduced using optically filtering techniques. However big disadvantages remain, like low wavelength flexibility and optical energy reduction.
Summary of the invention
The present invention seeks to provide a device structure and method to provide (suppressed carrier) optical single side band (OSSB/SC-OSSB) signals with a low complexity and high quality, which are also flexible, robust and broadband.
According to the present invention, an optical beam generator according to the preamble defined above is provided, wherein a beam splitter is connected to the carrier beam input and the signal beam input to obtain quadrature carrier beam components and quadrature signal beam components, first and second nonlinear photonic crystals are arranged to mix associated quadrature beam components of the quadrature carrier beam components and the quadrature signal beam components into optical double side band signals, and a combiner element is arranged to receive the optical double side band signals and to provide an optical single side band signal using coherent addition or coherent subtraction. This optical circuit allows to provide a flexible, robust and broadband single side band optical signal generation, e.g. in the THz frequency range.
In a further embodiment, the beam splitter comprises a carrier beam dichroic splitter and a signal beam dichroic splitter. Using these type of optical components provides for an inherent ultra wide band circuit.
The beam splitter comprises a single dichroic beam splitter in a further embodiment, allowing integration and a more compact design of the optical beam generator.
The combiner element and/or the beam splitter comprise multi-mode interference structures, providing an even further integrated optical circuit. The optical beam generator elements may be combined in a planar lightwave circuit in an even further embodiment, providing a fully integrated optical beam generator.
Short description of drawings
The present invention will be discussed in more detail below, using a number of exemplary embodiments, with reference to the attached drawings, in which
Fig. 1 shows a schematic view of a first embodiment of the optical signal generator according to the present invention;
Fig. 2 shows a schematic view of a second embodiment of the optical signal generator according to the present invention;
Fig. 3 shows a schematic view of a third embodiment of the optical signal generator according to the present invention; and
Fig. 4 shows a schematic view of a first embodiment of the optical signal generator according to the present invention.
Detailed description of exemplary embodiments
The present invention embodiments in general wording relate to an optical beam generator, comprising a carrier beam input 1 and a signal beam input 2, as shown in the schematic views of several embodiments as depicted in Fig. 1-4. A beam splitter is 3 connected to the carrier beam input 1 and the signal beam input 2 to obtain quadrature carrier beam components and quadrature signal beam components. First and second nonlinear photonic crystals 4, 5 are arranged to mix associated quadrature beam components of the quadrature carrier beam components and the quadrature signal beam components into optical double side band signals. A combiner element 6 is arranged to receive the optical double side band signals and to provide an optical single side band signal using coherent addition or coherent subtraction.
In general, nonlinear photonic crystals (NPC) are media, which possess nonlinear electric dipoles in their atomic system, due to irradiation by one, two or more light waves simultaneously. The dielectric polarization P of the NPC responds nonlinear to the electric field E of light and electricity, and can be used to drive various optical nonlinear phenomena, The susceptibility χ of the media for nonlinear process (χ(2),χ(3),. · ) is used for instance for optical rectification, sum and difference frequency generation, second harmonic generation, four wave mixing, etc. Common media are crystals, like LiNb03, BBO, ZnTe, GaP, DAST, Si, etc
The invention embodiments provide a new device for ultra wide band optical suppressed carrier single sideband (SC-OSSB) generation from optical signals. The new SC-OSSB method is a new composition of optical phase changing elements, which as such are known in the field. It accomplishes the necessary coherent interferometric process of OSSB and SC-OSSB modulation.
In the embodiment shown schematically in Fig. 1, the optical signal generator comprises a beam splitter 3 having a carrier beam dichroic splitter 11 and a signal beam dichroic splitter 12. The carrier beam dichroic splitter 11 is at an angle of 45° to the impinging earner beam 1, resulting in a split in an in-phase and quadrature component of the carrier beam 1. These are further guided towards the first and second non linear photonic crystals 4, 5, using a carrier mirror 13. Similarly, the signal beam dichroic splitter 12 is at an angle of 45° to the impinging signal beam 2, resulting in a split in an in-phase and quadrature component of the signal beam 2. These are further guided towards the first and second non linear photonic crystals 4, 5, using a signal mirror 14. It is noted that optical distances from the carrier beam splitter 11 to the first and to the second nonlinear photonic crystal 4, 5 are equal, by having the same distance a between the carrier beam 1 optical axis and carrier mirror 13, as between the first and second non linear photonic crystal 4, 5. Similarly, optical distances from the signal beam splitter 12 to the first and to the second nonlinear photonic crystal 4, 5 are equal, by having a similar distance a between the exit surface of the signal beam dichroic splitter 12 and signal mirror 14.
From the non linear photonic crystals 4, 5, the optical beam is guided using fiber couplers 7 and optical fibers 8 towards the combiner element 6, in this case an optical 2x1 combiner. At the output, again a fiber coupler 7 is used to provide the optical single side band beam 10 at the output of the optical beam generator.
In the present invention embodiments a (lossless) dichroic beam splitter 3 is used, which creates signal and carrier beams in quadrature, only to satisfy fundamental physical laws like conservation of energy and unitarity. Due to the dichroism of the beam splitter 3 (or carrier beam splitter 11/signal beam splitter 12), each carrier beam can be mixed with a signal beam in a nonlinear photonic crystal (NPC) 4, 5 to generate optical double sideband (ODSB) modulation. Both ODSB modulated carrier beams are then coherently added or subtracted in the combiner element 6. The result is broadband OSSB and SC-OSSB modulation beams from mixing electromagnetic signals and carriers in NPC’s 4, 5.
Dichroic mirrors/beam splitters feature wavelength ranges for both transmission and reflection of light. Transmission and reflection are 50% at the cutoff wavelength. The OSSB solution presented here is general for each wavelength and solely depends on the dichroism of the beam splitter coatings.
In a further embodiment which is shown schematically in Fig. 2, the multiple dichroic mirror coatings as used in the embodiment of Fig. 1, are e g. deposited on a single beam splitter substrate. More in general, the beam splitter 3 comprises a single dichroic beam splitter. Due to the mutual orientation as shown in Fig. 2, optical distances from the single dichroic beam splitter 3 to the first and to the second nonlinear photonic crystal 4, 5 are equal.
In even further embodiments, the optical nature of all elements of the optical beam generator is exploited to allow miniaturization using planar lightwave circuitry (PLC) and multi-mode interference (MMI) structures. E.g. the combiner element (6) may comprise a multi-mode interference structure (15) as shown in the schematic views of the further embodiments in Fig. 3 and Fig. 4.
As shown in the embodiment of Fig. 4, the beam splitter 3 may comprise a configuration of four multi-mode interference structures 16-19. The carrier beam 2 is guided to a first MMI element 16, providing an in-phase carrier beam component 21 and a quadrature carrier beam component 22. The signal beam 1 is guided to a second MMI element 17, providing an in-phase signal beam component 23 and a quadrature signal beam component 24. The in-phase carrier beam component 21 and in-phase signal beam component 23 are combined in a third MMI element 18 and output to the first non linear photonic crystal 4. The quadrature carrier beam component 22 and quadrature signal beam component 24 are combined in a fourth MMI element 19 and output to the second non linear photonic crystal 5. Eventually, the output beams from the first and second non linear photonic crystals 4, 5 are combined in the combiner MMI element 15, and provided as output from the optical beam generator as OSSB beam 10.
The entire mix of components of the optical beam generator of the embodiments shown in Fig. 3 and Fig. 4 may be implemented as a planar lightwave circuit 20. Connections between components may be provided using suitably designed integrated lightwaves and couplers. In general wording, one or more of the optical beam generator elements may be combined in a planar lightwave circuit 20.
The present invention embodiments can be summarized as follows:
Embodiment 1. Optical beam generator, comprising a carrier beam input (1) and a signal beam input (2), a beam splitter (3) connected to the carrier beam input (1) and the signal beam input (2) to obtain quadrature carrier beam components and quadrature signal beam components, first and second nonlinear photonic crystals (4, 5) arranged to mix associated quadrature beam components of the quadrature carrier beam components and the quadrature signal beam components into optical double side band signals, and a combiner element (6) arranged to receive the optical double side band signals and to provide an optical single side band signal using coherent addition or coherent subtraction.
Embodiment 2. Optical beam generator according to embodiment 1, wherein the beam splitter (3) comprises a carrier beam dichroic splitter (11) and a signal beam dichroic splitter (12).
Embodiment 3. Optical beam generator according to embodiment 2, wherein optical distances from the carrier beam splitter (11) to the first and to the second nonlinear photonic crystal (4, 5) are equal.
Embodiment 4. Optical beam generator according to embodiment 2 or 3, wherein optical distances from the signal beam splitter (12) to the first and to the second nonlinear photonic crystal (4, 5) are equal.
Embodiment 5. Optical beam generator according to embodiment 1, wherein the beam splitter (3) comprises a single dichroic beam splitter.
Embodiment 6. Optical beam generator according to embodiment 5, wherein optical distances from the single dichroic beam splitter (3) to the first and to the second nonlinear photonic crystal (4, 5) are equal.
Embodiment 7. Optical beam generator according to any one of embodiments Ιό, wherein the combiner element (6) comprises a multi-mode interference structure (15).
Embodiment 8. Optical beam generator according to any one of embodiments 1- 7, wherein the beam splitter (3) comprises multi-mode interference structures (16-19).
Embodiment 9. Optical beam generator according to any one of embodiments 1- 8, wherein one or more of the optical beam generator elements are combined in a planar lightwave circuit (20).
The present invention embodiments have been described above with reference to a number of exemplary embodiments as shown in the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.

Claims (9)

1. Optische-bundelgenerator, omvattende een draaggolfbundelinvoer (1) en een signaalbundel invoer (2), een bundelsplitser (3) verbonden met de draaggolfbundelinvoer (1) en de signaalbundelinvoer (2) teneinde quadratuur draaggolfbundelcomponenten en quadratuur signaalbundelcomponenten te verkrijgen, eerste en tweede niet-lineaire fotonische kristallen (4, 5) die zijn ingericht om bijbehorende quadratuur bundelcomponenten van de quadratuur draaggolfbundelcomponenten en de quadratuur signaalbundelcomponenten te mengen tot optische dubbelzijband signalen, en een combineerelement (6) dat is ingericht om de optische dubbelzijband signalen te ontvangen en om een optische enkelzijbandsignaal te verschaffen met gebruik van coherente optelling of coherente aftrekking.An optical beam generator, comprising a carrier-beam input (1) and a signal-beam input (2), a beam splitter (3) connected to the carrier-beam input (1) and the signal-beam input (2) to obtain quadrature carrier-wave components and quadrature signal-beam components non-linear photonic crystals (4, 5) adapted to mix associated quadrature bundle components of the quadrature carrier wave components and the quadrature signal bundle components into optical double sideband signals, and a combining element (6) adapted to receive the optical double sideband signals and to provide an optical single-sideband signal using coherent addition or coherent subtraction. 2. Optische-bundelgenerator volgens conclusie 1, waarbij de bundelsplitser (3) een draaggolfbundel dichroïsche splitser (11) en een signaalbundel dichroïsche splitser (12) omvat.The optical beam generator according to claim 1, wherein the beam splitter (3) comprises a carrier beam dichroic splitter (11) and a signal beam dichroic splitter (12). 3. Optische-bundelgenerator volgens conclusie 2, waarbij optische afstanden van de draaggolfbundel splitser (11) tot het eerste en tot het tweede niet-lineaire fotonische kristal (4, 5) gelijk zijn.The optical beam generator according to claim 2, wherein optical distances from the carrier beam splitter (11) to the first and to the second non-linear photonic crystal (4, 5) are equal. 4. Optische-bundelgenerator volgens conclusie 2 of 3, waarbij optische afstanden van de signaalbundelsplitser (12) tot het eerste en tot het tweede niet-lineaire fotonische kristal (4, 5) gelijk zijn.The optical beam generator according to claim 2 or 3, wherein optical distances from the signal beam splitter (12) to the first and to the second non-linear photonic crystal (4, 5) are equal. 5. Optische-bundelgenerator volgens conclusie 1, waarbij de bundelsplitser (3) een enkele dichroïsche bundelsplitser omvat.The optical beam generator according to claim 1, wherein the beam splitter (3) comprises a single dichroic beam splitter. 6. Optische-bundelgenerator volgens conclusie 5, waarbij optische afstanden van de enkele dichroïsche bundelsplitser (3) tot het eerste en tot het tweede niet-lineaire fotonische kristal (4, 5) gelijk zijn.The optical beam generator according to claim 5, wherein optical distances from the single dichroic beam splitter (3) to the first and to the second non-linear photonic crystal (4, 5) are equal. 7. Optische-bundelgenerator volgens één van de conclusies 1-6, waarbij het combineerelement (6) een multi-modus interferentiestructuur (15) omvat.The optical beam generator according to any of claims 1-6, wherein the combining element (6) comprises a multi-mode interference structure (15). 8. Opti sche-bundelgenerator volgens één van de conclusies 1-7, waarbij de bundelsplitser (3) multi-modus interferentiestructuren (16-19) omvat.The optical beam generator according to any of claims 1-7, wherein the beam splitter (3) comprises multi-mode interference structures (16-19). 9. Opti sche-bundelgenerator volgens één van de conclusies 1-8, waarbij één of meer van de optische-bundelgeneratorelementen zijn gecombineerd in een vlakke lichtgolfschakeling (20).The optical beam generator according to any of claims 1-8, wherein one or more of the optical beam generator elements are combined in a planar light wave circuit (20).
NL2012906A 2014-05-28 2014-05-28 Ultra wide band suppressed carrier optical single side band signal generation. NL2012906B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003023502A1 (en) * 2001-09-11 2003-03-20 Rmit University Optical modulator
EP1739865A1 (en) * 2005-07-01 2007-01-03 Siemens Aktiengesellschaft Method for transmitting a data signal and optical communication system with dispersion precompensation
US20080002984A1 (en) * 2004-09-16 2008-01-03 Ui-Soo Lee Optical Transmission System Using Ossb-Modulation and Signal Trasmission Method Thereof
CN101800606A (en) * 2010-02-05 2010-08-11 上海交通大学 Optical single-side band modulating device
CN103490821A (en) * 2013-09-13 2014-01-01 南京航空航天大学 Light single side band polarization modulation method and device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003023502A1 (en) * 2001-09-11 2003-03-20 Rmit University Optical modulator
US20080002984A1 (en) * 2004-09-16 2008-01-03 Ui-Soo Lee Optical Transmission System Using Ossb-Modulation and Signal Trasmission Method Thereof
EP1739865A1 (en) * 2005-07-01 2007-01-03 Siemens Aktiengesellschaft Method for transmitting a data signal and optical communication system with dispersion precompensation
CN101800606A (en) * 2010-02-05 2010-08-11 上海交通大学 Optical single-side band modulating device
CN103490821A (en) * 2013-09-13 2014-01-01 南京航空航天大学 Light single side band polarization modulation method and device

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