Star coupler based WDM switch employing tunable devices with reduced tunability range

Obara, H.; Hamazumi, Y.

doi:10.1049/el:19920803

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…k0 K=, ko=?, (5) 18OO (6) where M is the refractive index modulation, is wavelength difference of channel ? from center wavelength For fixed thickness volume hologram, the diffraction efficiency of volume hologram can be controlled by refractive index modulation.…”

Section: Polymer-based Volume Phase Hologram Couplermentioning

confidence: 99%

“…At the transmission end, a WDM was used to combine all wavelengths into a single fiber while a WDDM was used at the output end to demultiplex different wavelengths. [1] During the past 20 years, various type of WDMs and WDDMs have been proposed and demonstrated [2][3][4][5][6][7]. Recently the technique for producing spatially-multiplexed phase grating using polymer-based waveguide holograms for WDDM applications has been reported [8,9].…”

Section: Introductionmentioning

confidence: 99%

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<title>Dispersion-enhanced wavelength division multiplexing</title>

Zhou

Dubinovsky

et al. 1997

SPIE Proceedings

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Wavelength division demultiplexer based on dispersive volume holograms and axial graded index(AGRIN) lenses is presented in this paper. The dispersive volume hologram was fabricated with DuPont photopolymer with two beam interference method. Close to 99% center wavelength diffraction efficiency was achieved and the dispersion property of a volume hologram was characterized with a mode-locked femto-second laser source. The experimental data were found to conform well with the theoretical derivations. Axial graded index (AGRIN) lenses have been used as focusing elements to separate light with different incident angles after dispersive volume holograms. By using dispersive volume holograms and AGRIN lenses, a wavelength division demultiplexer with 1 540 nm center wavelength and a 4 nm channel separation was demonstrated.By using two stacked holograms, light dispersion can be further enhanced up to five times. Therefore smaller devices and smaller channel separations can be realized.

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Section: Polymer-based Volume Phase Hologram Couplermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

<title>Dispersion-enhanced wavelength division multiplexing</title>

Zhou

Dubinovsky

et al. 1997

SPIE Proceedings

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“…The central wavelength bouncing angle O is set at 450W For maximum diffraction efficiency at the central wavelength, the grating spacing A must satisfy the following relationship: 0 =2sin(.2_-), (1) where L, is the central wavelength, A is the grating spacing and n is the polymer refractive index. cr=l, c=1-k ' (5) K=E, k0=, (6) SPIE Vol. 2690 / 255 cI= 2 (7) where zn is the refractive index modulation, is wavelength difference of channel X1 from center wavelength…”

Section: Wdm Transmittermentioning

confidence: 99%

<title>Polymer-based volume holograms for multiple wavelength network applications</title>

Zhou

Chen

1996

SPIE Proceedings

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Wavelength division multiplexing (WDM) and demultiplexing (WDDM) devices are considered to be two of the key elements for enhancing the transmission bandwidth of optical communications and sensor systems. During the past 20 years, various type of WDMs and WDDMs have been proposed and demonstrated [1-7J. Recently the technique for producing spatially multiplexed phase grating based on polymer-based waveguide holograms for WD(D)M applications has been reported [7,8,9]. We report the formation of a surface-normal wavelength division demultiplexer using photopolymer-based volume holograms in conjugation with graded index (GRIN) lenses. The elimination of edge-coupling significantly enhances the packaging reliability and the time reversal of the beam propagation automatically results in the required wavelength division multiplexing (WDM). Furthermore, such a configuration is compatible with the implementation of vertical cavity surface-emitting lasers where the characteristic of azimuthal symmetry is maintained in the waveguiding substrate.In this paper, we present two devices for network applications. The first is an 8 channel surface-normal WDM with a center channel wavelength of 772 nm and a wavelength separation of 4 nm. The second is a 3x3 wavelength selective crossbar with a center wavelength of 765 nm and a channel separation of 10 nm. These devices are pivotal for the realization of such a computer-to-computer interconnect network shown in Fig. 1 [1] where both wavelength division multiplexing and space division multiplexing are employed to enhance the transmission bandwidth. The switching device depicted in Fig. 1 can be realized using the wavelength-selective crossbar to be presented in this paper. Timing - SignalsHeader! Data Fig. 1 JPL's Bit-Parallel Wavelength Links for High Performance Computer Networks [1] 0_819420646/96/$6.00 SPIE Vol. 2690/253 Time D4J I__i Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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“…During the past 20 years, various types of WDMs and WDDMs have been proposed and demonstrated. [1][2][3][4][5][6] Recently, the technique for producing spatially multiplexed phase gratings in locally sensitized photolime gel ͑PLG͒ polymer waveguides for WD͑D͒M applications has been reported. 7,8 In this letter, we report on the demonstration of a novel two-channel WDDM using collinear surface-normal input and output couplings based on the same polymeric material.…”

mentioning

confidence: 99%

Two-channel surface-normal wavelength division demultiplexer using substrate guided waves in conjunction with multiplexed waveguide holograms

Chen

1995

Applied Physics Letters

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We report a wavelength division demultiplexer (WDDM) using collinear surface-normal input and output coupling. The reported device employs polymer-based multiplexed waveguide holograms in conjunction with substrate guided waves. A two-channel WDDM device operating at 700 and 738 nm with diffraction angles of 45° and 50° are demonstrated. The peak diffraction efficiencies of 80% and 77% are measured for these two channels. A crosstalk of −31 dB between the two channels is measured. Variations of the diffraction efficiencies and of the bandwidths as a function of film thickness and index modulation are further considered. A good agreement between theoretical analysis and experimental results is obtained.

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Star coupler based WDM switch employing tunable devices with reduced tunability range

Cited by 6 publications

References 1 publication

<title>Dispersion-enhanced wavelength division multiplexing</title>

<title>Dispersion-enhanced wavelength division multiplexing</title>

<title>Polymer-based volume holograms for multiple wavelength network applications</title>

Two-channel surface-normal wavelength division demultiplexer using substrate guided waves in conjunction with multiplexed waveguide holograms

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