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`PROVISIONAL APPLICATION under 37 C.F.R. §l.53(b)(2)
`
`TRANSMITTAL FORM
`
`Docket Number: TI-33025138
`
`i||||||||i||Iliiliflliimllililillll
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`0'5/2
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`
`
`
`
`
`
`i i
`
`“EXPRIESS MAILING" Mailing Label No. EL547741825US ,
`Date of Deposit: May 23, 2001.
`
`1 i
`
`ii1
`
`Spec w/ Claims
`Spec w/o Claims
`Formal Drawings
`Informal Drawings
`Other:
`
`MIDDLE
`
`INITIAL
`l"‘
`
`Number of Pages
`Number of Pages
`Number of Sheets
`Number of Sheets
`
`RESIDENCE (City, State or Foreign Country)
`
`4214 Alta Vista Lane, Dallas TX 75229
`
`10248 Ironwood Lane, Dallas, TX 75249
`280 West Renner Road #1011, Richardson, TX 75080
`
`Box Provisional Patent Application
`Assistant Commissioner For Patents
`Washington, DC. 20231
`
`Examiner:
`
`Enclosed application parts are:
`
`lnventor(s)
`LAST NAME
`
`FIRST NAME
`
`
`
`6
`
`
`
`Elisabeth
`
`TITLE OF INVENTION:
`
`
`
`
`
`CORRESPONDENCE ADDRESS:
`
`METHOD FOR PATTERN GENERATION
`
`Charles A. Brill
`Customer Number 23494
`
`Phone Number: (972) 917-4379
`Fax Number: (972) 917-4418
`
`EJAmlAdme$:C~bflH@2lLCOn1
`
`Was this invention made under a Government contract?
`
`X
`
`No
`
`Yes
`
`Identify contract and the Government agency:
`
`Please charge $150.00 and any additional fees to the deposit account of Texas Instruments
`Incorporated, Deposit Account No. 20-0668.
`An original and two copies are enclosed.
`
`Respectfully submitted,
`
`&6/zg/
`Charles A. Brill
`
`Reg. No. 37,786
`
`Date:
`
`5=23’Zv0/
`
`PROVISIONAL APPLICATION ONLY
`
`FNC 1035
`
`FNC 1035
`
`
`
`
`
`METHOD FOR PATTERN GENERATION
`
`When using an array of small mirrors to modulate coherent light, it is difficult to
`
`determine the spatial pattern of mirror positions that should be achieved by the mirror
`
`array in order to achieve a given attenuation level and maintain efficient coupling to an
`
`output fiber. Such a systems may use a digital micromirror device to attenuate one or
`
`more wavelengths to achieve a dynamic optical filter, a variable wavelength equalizer, or
`
`any of a number of applications.
`
`In the case of a fiber-interfaced system, efficient coupling back into the fiber
`
`requires matching of the spatially modulated profile to the fiber mode profile. This is
`
`generally done in free space by focusing a coherent beam onto the spatial light
`
`modulator, and focusing the reflected or transmitted light onto another fiber. Because of
`
`the need to couple light back into the fiber, the relationship between the digital spatial
`
`pattern and the amount of light coupled into the fiber is not straightforward. The task is
`
`made more difficult by several factors: 1) The weighting of the various pixels by the
`
`
`
`gaussian beam shape, 2) The complex interaction between the various pixels on the
`
`spatial light modulator due to optical phase, and 3) The large number of possible patterns
`
`to be displayed (2"N for N total binary pixels) 4) The need to minimize modulated signal
`
`distortion. Pattern generation must take into account the intensity and spectral
`
`distribution of the signal across the DMD, and any phase disturbance generated by the
`
`DMD and/or the optics in the system.
`
`Depending on the particular application, the number and types of patterns to be
`
`used on the spatial light modulator is further restricted. For example, in a Wavelength
`
`Division Multiplexed (WDM) system in which the wavelength channels are dispersed
`
`TI-33025PS — Page 1
`
`
`
`and separated spatially at the spatial light modulator, care must be taken not to distort the
`
`spectral shape of the modulated signals. Generally, the pattern generation scheme must
`
`preserve the integrity of any modulation scheme of the incident signals.
`
`A model has been developed to predict the relationship between the optical
`
`system, the various pixel states, and the amount of light coupled through the system. The
`
`model requires that each pixel within the spatial light modulator be characterized with an
`
`amplitude and phase value. The algorithm for creating spatial patterns is then
`
`summarized as follows:
`
`1. Algorithm displays an array of test patterns; estimates of phase and amplitude
`
`values associated with each pixel within the spatial light modulator are then
`
`calculated.
`
`2. A set of periodic patterns are generated, and the corresponding attenuation
`
`levels are calculated or measured using the current understanding of the
`
`effects of pattern shape on the modulation scheme, and any specified system-
`
`level parameters (e.g. bit error rate, or crosstalk). This set of patterns forms a
`
`look up table for fiiture reference.
`
`3. Stored reference patterns are used for coarse attenuation levels. Finer steps of
`
`attenuation are attained by toggling a small number of pixels within each of
`
`the periodic patterns and successively calculating/measuring attenuation
`
`levels. The process of finding the suitable fine attenuation and phase clues
`
`from the previously generated per pixel amplitude and phase maps to limit the
`
`search.
`
`
`
`Tl-33025PS —— Page 2
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