Optical waveguides – Optical fiber waveguide with cladding – With graded index core or cladding
Reexamination Certificate
2005-02-15
2005-02-15
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
With graded index core or cladding
C372S006000, C398S079000
Reexamination Certificate
active
06856741
ABSTRACT:
A free space wavelength duplexed system includes first and second terminals. The first terminal includes an optical transmitter and an optical receiver. The optical receiver has a telescope, an optical to electrical converter and an optical amplifier coupled between the telescope and the optical to electrical converter. A method includes the steps of receiving a received optical signal through a telescope, diverting the received optical signal in an optical splitter into an optical amplifier, and transmitting a transmit optical signal through the optical splitter to the telescope. Another method includes the steps of receiving plural received optical signals through a telescope, diverting the plural received optical signals in an optical splitter into an optical amplifier, separating the plural amplified optical signals by wavelength, and transmitting plural transmit optical signals at distinct wavelengths through the optical splitter to the telescope.
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patent: 6735356 (2004-05-01), Britz et al.
F. M. Davidson et al., “Interleaved Convolutional Coding For The Turbulent Atmospheric Optical Communication Channel”, IEEE Transactions On Communications, vol. 36, No. 9, Sep. 1988, pp. 993-1003.
K. E. Wilson et al., “Multiple-Beam Transmission For Optical Communication”, NASA Tech Brief, vol. 22, No. 11, Nov. 1998, 2 pages.
AT&T Corp.
Ullah Akm Enayet
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