WO2004097472A1 - Dispositif optique a faible perte de resonance - Google Patents

Dispositif optique a faible perte de resonance Download PDF

Info

Publication number
WO2004097472A1
WO2004097472A1 PCT/EP2003/004520 EP0304520W WO2004097472A1 WO 2004097472 A1 WO2004097472 A1 WO 2004097472A1 EP 0304520 W EP0304520 W EP 0304520W WO 2004097472 A1 WO2004097472 A1 WO 2004097472A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
grating
cavity
waveguides
waveguide
Prior art date
Application number
PCT/EP2003/004520
Other languages
English (en)
Inventor
Daniele Faccio
Giacomo Gorni
Marco Romagnoli
Original Assignee
Pirelli & C. S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pirelli & C. S.P.A. filed Critical Pirelli & C. S.P.A.
Priority to PCT/EP2003/004520 priority Critical patent/WO2004097472A1/fr
Priority to PCT/EP2004/004545 priority patent/WO2004097473A1/fr
Publication of WO2004097472A1 publication Critical patent/WO2004097472A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/124—Geodesic lenses or integrated gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12083—Constructional arrangements
    • G02B2006/12104—Mirror; Reflectors or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12083—Constructional arrangements
    • G02B2006/12109—Filter
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12133—Functions
    • G02B2006/12159—Interferometer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12133—Functions
    • G02B2006/12161—Distributed feedback [DFB]

Definitions

  • the present invention generally relates to resonant optical devices, and particularly to resonant optical devices for Wavelength Division Multiplexing (WDM) optical communication systems. More specifically, the present invention relates to a low loss resonant optical device .
  • WDM Wavelength Division Multiplexing
  • Resonant optical devices can be implemented using different structures.
  • An exemplary Fabry-Perot cavity comprises a region bounded by two planes, parallel mirrors.
  • the structure as an entity, transmits only certain wavelengths, for which the cavity is said to be in "resonance", a condition obtained by appropriately adjusting the cavity parameters.
  • the cavity transmits a series of equally spaced wavelengths.
  • the spacing between wavelengths called the "free spectral range" of the cavity (FSR)
  • FSR free spectral range
  • Another well-known structure is the ring shaped cavity described, for example, in US 6,052, 495.
  • the ring shaped cavity disclosed in US 6,052, 495 consists of an optical cavity that is weakly coupled to two waveguides.
  • One guide serves as an input waveguide having an input port and a throughput port.
  • the other guide also weakly coupled to the cavity, but not to the input waveguide, serves as an output waveguide and has an output port.
  • the cavity supports resonances at a number of wavelengths, which are determined by the geometrical details and refractive index distribution of the cavity.
  • an optical all-pass filter comprising a substrate-supported multilayer waveguiding structure comprising a first layer including a waveguiding optical ring resonator, a second layer including an optical grating optically coupled to the ring resonator, and a third layer including a relatively straight waveguide optically coupled to the grating.
  • the waveguide can be made with standard index material matched to an optical communication system, and the ring can be made of higher index material.
  • the grating sandwiched between them provides phase matching between these two index mismatched structures, facilitating efficient power transfer between them.
  • a resonant optical device comprising an optical cavity coupled to an input and an output waveguide.
  • the optical cavity comprises first and second optical waveguides arranged so as to be in optical coupling relationship in spaced-apart first and second regions, each region comprising a reflecting element, and sufficiently spaced-apart from each other so as to be optically uncoupled along respective sections located between the first and the second regions.
  • the optical cavity is coupled to the input and the output waveguide along the uncoupled sections of the first and the second optical waveguides.
  • the reflecting element include optical gratings .
  • a resonant optical device comprising an optical cavity coupled to an input and an output waveguide .
  • the optical cavity comprises first and second optical waveguides arranged so as to be in optical coupling relationship in spaced-apart first and second regions, each comprising a reflecting element, and sufficiently spaced-apart from each other so as to be optically uncoupled along respective sections located between said first and second regions.
  • the optical cavity is coupled to said input and output waveguides along said uncoupled sections of said first and second regions .
  • each region includes a grating based device and the reflecting element comprises preferably optical gratings .
  • said grating based device includes a Grating-Assisted Contradirectional Coupler.
  • the Grating-Assisted Contradirectional Coupler comprises an optical grating acting both as a coupler and as a reflecting element for coupling and reflecting optical signals resonating in said optical cavity between said first and second optical waveguides.
  • the optical grating can be made into one or both core regions of said optical waveguides and/or into a cladding layer formed between said two optical waveguides .
  • said grating based device includes a grating on coupler comprising:
  • said grating based device includes a grating on Mach-Zehnder comprising:
  • a Mach-Zehnder interferometer formed by said first and second optical waveguides arranged so as to be in optical coupling relationship in an optical coupling zone and optically uncoupled in a zone adjacent said optical coupling zone, in said optical coupling zone respective sections of said first and second optical waveguides being in close proximity to each other and in said zone respective sections of said first and second optical waveguides being sufficiently spaced-apart from each other so as to be optically uncoupled;
  • optical gratings each formed along one section of said first and second optical waveguides, said optical gratings being located in corresponding positions along said sections.
  • the optical coupling zone comprises a 50/50 directional coupler and each sections of said first and second optical waveguides forms one interferometric arm of said Mach Zehnder interferometer.
  • the optical gratings can act as a mirror so as to guarantee a total reflection at all possible wavelengths resonating in said optical cavity or they can have a reflection band centred at a predetermined wavelength resonating in said optical cavity or they can comprise at least one ⁇ -shifted region whose location and magnitude are chosen so as to obtain zero reflection at wavelengths neighboring a resonant wavelength. Further said optical gratings may be deep or medium or shallow gratings .
  • a method for dropping optical signals in Wavelength Division Multiplexing (WDM) optical communications comprises the following steps: sending a plurality of optical signals S( ⁇ l),
  • the method comprises the step of: transmitting the remaining optical signals resonating in said optical cavity.
  • figure 1 is a schematic view of the resonant optical device realized according to the present invention
  • figure 2 shows in diagrammatic form optical response of components
  • - figure 3 shows a schematic view of an embodiment of components of the resonant optical device of figure 1;
  • - figure 4 shows a schematic view of another embodiment of components of the resonant optical device of figure 1;
  • - figure 5 shows a response of the resonant optical device of figure 1; and - figures 6-8 are schematic views of applications of the resonant optical device of figure 1.
  • FIG. 1 schematically shows a resonant optical device 1 made according to the present invention.
  • the resonant optical device 1 comprises an optical cavity 2 that is coupled to two optical waveguides: an input waveguide 3 and an output waveguide 4.
  • the input waveguide 3 has an input port 3a and a throughput port 3b while the output waveguide 4 has a drop port 4a and optionally an add port 4b.
  • the optical cavity 2 comprises first and second optical waveguides 5, 6 arranged so as to be in optical coupling relationship in spaced-apart first and second regions 7, 8, each region comprising a reflecting element 9.
  • the two optical waveguides 5, 6 include also respective sections 5a, 6a located between the first and the second regions 7, 8 which are sufficiently spaced apart from each other so as to be optically uncoupled.
  • the optical cavity 2 is coupled to the input and the output waveguide 3, 4 respectively.
  • a wavelength division multiplexed optical signal S IN ⁇ S( ⁇ l), S( ⁇ 2), ..., S ( ⁇ n) ⁇ made up of a plurality (two or more) of optical signals S( ⁇ l), S( ⁇ 2), ..., S ( ⁇ n) is applied to the input port 3a.
  • Each of the optical signals S( ⁇ l), S( ⁇ 2), ...,S( ⁇ n) is assigned a respective wavelength band (also referred to as a channel) centred on a respective wavelength ⁇ l, ⁇ 2, ..., ⁇ n (also referred to as the channel central wavelength) .
  • the optical cavity 2 is able to support resonances at a number of equally spaced wavelengths (whose spacing is the "free spectral range" of the cavity) .
  • optical power associated to each optical signals S( ⁇ l), S( ⁇ 2), ..., S ( ⁇ n) and fed into the optical cavity 2 along the section 5a, is coupled and reflected between the two optical waveguides 5, 6 in each region 7, 8. In this way the optical power circulates in the optical cavity 2 and builds up to large intensities.
  • Energy in the optical cavity 2 at resonance also couples to the output waveguide 4 along the section 6a.
  • each regions 7, 8 includes a grating based device and the reflecting element 9 preferably includes optical gratings.
  • the grating based device includes a conventional Grating-Assisted Contradirectional Coupler (GACC) of the type described for example in P. Yeh and F. Taylor, "Contradirectional frequency-selective couplers for guided-wave optics," Appl. Opt., vol 19, pp. 2848-2855, 1980.
  • GACC Grating-Assisted Contradirectional Coupler
  • the GACC comprises an optical grating acting both as a coupler and a reflecting element for coupling and reflecting the optical signals resonating in the optical cavity 2 between the two optical waveguides 5, 6.
  • the optical grating can be made into one or both core regions of the optical waveguides 5, 6, and/or into a cladding layer formed between the two optical waveguides 5, 6.
  • the optical grating acts as a mirror so as to guarantee a total reflection at all possible wavelengths resonating in the optical cavity 2.
  • An optical grating of this type is for example described in J. Ctyroky, "Photonic bandgap structures in planar waveguides", J. Opt. Soc. Am. A, Vol. 18, No. 2, February 2001, pages 435-441.
  • the optical grating has a reflection band or stop band centred at a predetermined wavelength resonating in the optical cavity 2, for example ⁇ i.
  • optical grating of this type is for example described in T. Bach, "Fiber Grating Spectra", Journal of Lightwave Technology, Vol. 15, No. 8, August 1997, pages 1277-1294.
  • the optical grating can also be apodized in order to smooth out its spectral response.
  • the optical grating comprises one or more ⁇ -shifted regions (defects) whose location and magnitude are properly chosen (apodization) so as to obtain zero reflection at wavelengths neighboring the resonant wavelength.
  • An optical grating of this type is for example described in A. Melloni and M. Martinelli, " Synthesis of Direct- Coupled- Resonators Bandpass Filters for WDM Systems", Journal of Lightwave Technology, Vol. 20, No. 2, February 2002, pages 296-303.
  • a reflection spectrum indicated with A
  • a transmission spectrum indicated with B
  • the optical grating has two defects centred at + 100 GHz. In this case two zeros centred at + 100 GHz appear in the reflection spectrum near the resonant wavelength.
  • the reflection spectrum shape is better (i.e. steeper roll-off) if compared with the reflection spectrum shape of a standard micro-ring cavity of the same order.
  • the optical grating is apodized then the reflection spectrum can be tailored into a nearly rectangular shape without using multiple resonant cavities (or using a lower number of resonant cavities) as it is necessary when standard micro-ring cavities are used. This result is obtained thanks to the fact that the apodization is performed on the grating rather than using multiple cavities. All the different types of optical gratings above- described can be made using deep or medium or shallow gratings .
  • the grating based device includes a grating on coupler of the type described for example in Y. Shibata et al., "Semiconductor Monolithic Wavelength Selective Router using a Grating Switch Integrated with a Directional Coupler, Journal of Lightwave Technology, Vol. 14, No. 6, June 1996, pages 1027-11032.
  • the grating on coupler includes a directional coupler 10 formed by the first and the second optical waveguides 5, 6 arranged so as to be in optical coupling relationship in an optical coupling zone 11, wherein respective sections 5b, 6b of the two optical waveguides 5, 6 are in close proximity to each other.
  • the directional coupler 10 can be a 100% optical coupler .
  • the grating on coupler also comprises optical gratings 12, 13 formed along each of the waveguide section 5b, 6b.
  • Each grating 12, 13 is positioned along the respective waveguide section 5b, 6b in such a way that a grating equivalent mirror appears in the point at which the optical power components in the individual optical waveguides sections 5b, 6b are equal to each other.
  • the grating equivalent mirror is an ideal lamped mirror equivalent to the grating as far as reflectivity is concerned, located in a prescribed position along the grating. In this way, for all possible wavelengths reflecting by the optical gratings 12, 13, the whole optical power is transferred from the first optical waveguide 5 to the second optical waveguide 6.
  • Optical gratings 12, 13 may be for example Bragg gratings or ⁇ -shifted gratings both of the types previously described with reference to the first embodiment of the present invention.
  • optical gratings can be' made using deep or medium or shallow gratings .
  • the reflecting element 9 may be a thin film or an optical mirror.
  • the grating based device includes a grating on Mach-Zehnder of the type described for example in Y. Hibino, "Wavelenght Division Multiplexer with Photoinduced Bragg Gratings Fabricated in a Planar-Lightwave- Circuit-Type Asymmetric Mach- Zehnder Interferometer on Si", IEEE Photonics Technology Letters, Vol. 8, No. 1, January 1996, pages 84-86.
  • the grating on Mach-Zehnder includes a portion 14 of a Mach-Zehnder interferometer formed by the first and the second optical waveguides 5, 6 arranged so as to be in optical coupling relationship in an optical coupling zone 15 and optically uncoupled in a zone 16 adjacent the optical coupling zone 15.
  • respective sections 5c, 6c of the two optical waveguides 5, 6 are in close proximity to each other while in the zone 16 respective sections 5d, 6d of the two optical waveguides 5, 6, are sufficiently spaced apart from each other so as to be optically uncoupled.
  • the optical coupling zone 15 forms a directional coupler, particularly a 50/50 (also referred to as 3dB) optical coupler: a half of the optical power circulating in the optical cavity 2 is transferred from the first optical waveguide 5 to the second optical waveguide 6. Further, each sections 5d, 6d of the two optical waveguides 5, 6 forms one interferometric arm of the Mach Zehnder interferometer.
  • the grating on Mach- Zehnder also comprises optical gratings 17, 18 each formed along one interferometer arm 5d, 6d.
  • the optical grating 17, 18 are located in corresponding positions along the interferometer arms 5d, 6d.
  • Optical gratings 17, 18 may be for example Bragg gratings or ⁇ -shifted gratings both of the types previously described with reference to the first embodiment of the present invention.
  • the different types of optical gratings can be made using deep or medium or shallow gratings .
  • the reflecting element 9 may be a thin film or an optical mirror.
  • Figure 5 illustrates simulation results (using a bidimensional FDTD software) of the operation of the resonant optical device 1 made with a grating on coupler of the type described above.
  • the general simulation results can be considered valid for any set of refractive indexes.
  • Input and output waveguides 3, 4 and optical waveguides 5, 6 were 200 nm wide so as to be single-moded. Further the minimum distance between the input (output) waveguides 3, 4 and the optical cavity 2 was 200 nm.
  • the grating on coupler was designed so as to reflect all light from one guide to the other for wavelengths near the optical cavity resonance (1.545 ⁇ m) .
  • the optical grating (deep grating) had 6 periods: each period was equal to 100 nm (cuts) + 280 nm (filled parts) . It totally reflected over a 300 nm bandwidth centered at 1.6 ⁇ m. No apodization was used. The total optical cavity 2 length was 42 ⁇ m.
  • the graph of figure 6 shows the optical power P (in dB) at the three ports 3a, 3b, 4a, of the resonant optical device 1 as a function of the wavelength ⁇ (in ⁇ m) .
  • the optical power at the input port 3a is represented by a continuous line; the optical power at the through port 3b is represented by a dotted line; the optical power at the drop port 4a is represented by a dashed line.
  • the total drop loss was 1 dB. This is mainly due to losses in reflection from the deep grating and to a small residual coupling to the input and output waveguides 3, 4 from the grating on coupler.
  • the resonant optical device 1 allows the use of very small optical cavities independently from the possible use of high index contrast waveguides.
  • the replacement of the micro-ring cavity 180° bends with the regions 7, 8 means that a very small cavity can be used without the need for high bending radius .
  • This in turn may allow the use of lower index contrast waveguides ( ⁇ n ⁇ 0.1) with lower losses in propagation and in coupling in and out of the waveguides .
  • the use of lower index contrast waveguides also allows to remove fabrication tolerance constraints from the cavity- waveguides distance value.
  • the minimum ⁇ n required may be determined by considering the relationship between the minimum bending radius and ⁇ n. For example, it is possible to make an optical cavity 2, which is 3.4 ⁇ m wide and 11.2 ⁇ m high using a 4 ⁇ m maximum bending radius extended to only a small 20° arc. This is to be compared with an equivalent micro-ring cavity (i.e. with the same total cavity length) which has a 3.1 ⁇ m bending radius extended over 90° arc.
  • Figures 6, 7, 8 illustrate optical add/drop devices based on the resonant optical device 1.
  • figure 6 shows a first optical add/drop device 100 comprising at least two spaced-apart resonant optical devices 101a, 101b accommodated between an input waveguide 102 and an output waveguides 103.
  • the input waveguide 102 has an input port 102a and a throughput port 102b while the output waveguide 103 has a drop port 103a and add port 103b.
  • the two resonant optical device 101a, 101b are indirectly coupled to each other by optical path lengths along the input and output waveguides. These optical path lengths determine the details of the resonant line shapes of the add/drop device 100.
  • an optical signal that is to be dropped from the input port 102a to the to the drop port 103a passes through the two resonant optical device 101a, 101b simultaneously.
  • Figure 7 shows a second optical add/drop device 200 comprising at least two resonant optical devices 201a, 201b vertically coupled between an input waveguide 202 and an output waveguides 203.
  • the input waveguide 202 has an input port 202a and a throughput port 202b while the output waveguide 203 has an add port 203a and a drop port 203b.
  • an optical signal for example the optical signal S ( ⁇ i) centred in the wavelength ⁇ i, that is to be dropped from the input port 202a to the drop port 203b passes sequentially through each resonant optical device 201a, 201b. Because of this sequential power transfer, the resonant optical devices 201a, 201b have in common a resonant condition existing at the wavelength ⁇ i. In this case, the resulting resonant line shape is determined physically by the separations between the resonant optical devices 201a, 201b.
  • Figure 8 shows a third optical add/drop device 300 comprising at least two resonant optical devices 301a, 301b connected in parallel through a common linear waveguide 303a acting as add port for the add/drop device 300.
  • the resonant optical device 301a is also coupled to an input waveguide 302 having an input port 302a and a throughput port 302b while the resonant optical device 301b is coupled to an output waveguide 303 having a drop port 303b.
  • a desired wavelength may be dropped from the input waveguide 302 to the output waveguide 303.

Abstract

L'invention concerne un dispositif optique résonant (1) comprenant une cavité optique (2) couplée à un guide d'onde d'entrée (3) et à un guide d'onde de sortie (4). La cavité optique (2) comprend des premier (5) et second (6) guides d'ondes optiques disposés de manière à être en relation de couplage optique dans des première et seconde zones (7, 8) espacées l'une de l'autre, chaque zone (7, 8) comprenant un élément réfléchissant (9) et étant suffisamment éloignés l'un de l'autre pour être découplés optiquement le long des parties respectives (5a, 6a) situées entre la première (7) et la seconde (8) zone. La cavité optique (2) est couplée au guide d'onde d'entrée (3) et au guide d'onde de sortie (4) le long de parties non couplées (5a, 6a) des premier (5) et second (6) guides d'ondes optiques.
PCT/EP2003/004520 2003-04-30 2003-04-30 Dispositif optique a faible perte de resonance WO2004097472A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2003/004520 WO2004097472A1 (fr) 2003-04-30 2003-04-30 Dispositif optique a faible perte de resonance
PCT/EP2004/004545 WO2004097473A1 (fr) 2003-04-30 2004-04-29 Dispositif optique de resonance a faibles pertes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/004520 WO2004097472A1 (fr) 2003-04-30 2003-04-30 Dispositif optique a faible perte de resonance

Publications (1)

Publication Number Publication Date
WO2004097472A1 true WO2004097472A1 (fr) 2004-11-11

Family

ID=33395691

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/EP2003/004520 WO2004097472A1 (fr) 2003-04-30 2003-04-30 Dispositif optique a faible perte de resonance
PCT/EP2004/004545 WO2004097473A1 (fr) 2003-04-30 2004-04-29 Dispositif optique de resonance a faibles pertes

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/004545 WO2004097473A1 (fr) 2003-04-30 2004-04-29 Dispositif optique de resonance a faibles pertes

Country Status (1)

Country Link
WO (2) WO2004097472A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658781A2 (fr) * 1993-12-16 1995-06-21 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Filtre résonnant pour systèmes de communication optiques par multiplexage à longeur d'onde

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658781A2 (fr) * 1993-12-16 1995-06-21 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Filtre résonnant pour systèmes de communication optiques par multiplexage à longeur d'onde

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
HIBINO Y ET AL: "WAVELENGTH DIVISION MULTIPLEXER WITH PHOTOINDUCED BRAGG GRATINGS FABRICATED IN A PLANAR-LIGHTWAVE-CIRCUIT-TYPE ASYMMETRIC MACH-ZEHNDER INTERFEROMETER ON SI", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE INC. NEW YORK, US, vol. 8, no. 1, 1996, pages 84 - 86, XP000547542, ISSN: 1041-1135 *
SHIBATA Y ET AL: "SEMICONDUCTOR MONOLITHIC WAVELENGTH SELECTIVE ROUTER USING A GRATING SWITCH INTEGRATED WITH A DIRECTIONAL COUPLER", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE. NEW YORK, US, vol. 14, no. 6, 1 June 1996 (1996-06-01), pages 1027 - 1032, XP000598507, ISSN: 0733-8724 *
VAZQUEZ C ET AL: "DESIGN AND TOLERANCE ANALYSIS OF A ROUTER WITH AN AMPLIFIED RESONATOR AND BRAGG GRATINGS", APPLIED OPTICS, OPTICAL SOCIETY OF AMERICA,WASHINGTON, US, vol. 39, no. 12, 20 April 2000 (2000-04-20), pages 1934 - 1940, XP000940125, ISSN: 0003-6935 *
YEH P ET AL: "CONTRADIRECTIONAL FREQUENCY-SELECTIVE COUPLERS FOR GUIDED-WAVE OPTICS", APPLIED OPTICS, OPTICAL SOCIETY OF AMERICA,WASHINGTON, US, vol. 19, no. 16, 15 August 1980 (1980-08-15), pages 2848 - 2855, XP000653007, ISSN: 0003-6935 *

Also Published As

Publication number Publication date
WO2004097473A1 (fr) 2004-11-11

Similar Documents

Publication Publication Date Title
Liu et al. Silicon photonic filters
Talebzadeh et al. All-optical 6-and 8-channel demultiplexers based on photonic crystal multilayer ring resonators in Si/C rods
Okamoto Wavelength-division-multiplexing devices in thin SOI: Advances and prospects
US7447403B2 (en) Integrated etched multilayer grating based wavelength demultiplexer
JPH0219805A (ja) 光波長分割マルチプレクシング装置
US5581639A (en) Raman-nath diffraction grating
EP3387473B1 (fr) Résonateur à micro-anneau accordable
US7245792B2 (en) Silicon-based tunable single passband optical filter
US20060222296A1 (en) Optical wavelength division multiplexer
JP4477260B2 (ja) 導波路型光カプラおよび該導波路型光カプラを用いた光合分波器
JP2004054223A (ja) 光ネットワークに適用される波長可変フィルタ
EP1677131B1 (fr) Coupleur optique avec réseau de Bragg à fibre optique et cavité de Fabry-Perot et procédé de son utilisation
Haus et al. Optical resonators and filters
JP2021071575A (ja) 光波長フィルタ
US6453094B1 (en) All fiber DWDM multiplexer and demultiplexer
US6351586B1 (en) Wavelength dependent phase delay device
US20040037563A1 (en) Device and method for optical add/drop multiplexing
WO2004097472A1 (fr) Dispositif optique a faible perte de resonance
US6763155B2 (en) Mach-zehnder interferomter (MZI) filter devices
US20060098917A1 (en) Integrated Optical Device
EP1581828B1 (fr) Dispositif d'insertion/extraction optique integre possedant une fonction de commutation et methode de commutation
US20030031412A1 (en) Optical arrayed waveguide grating devices
Preble et al. Passive silicon photonic devices
JP2001514766A (ja) 少なくとも１つのブラッグ格子構造体を含む波長選択光デバイス
Jia et al. Design and comparison of two kinds of silicon-on-insulator wavelength demultiplexers based on multimode interference

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): US