Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2003-07-28
2008-08-19
Tran, Dzung (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S083000, C398S085000
Reexamination Certificate
active
07415210
ABSTRACT:
The optical signal multiplexer/demultiplexer of the invention is characterized by incorporating a bidirectional optical transceiver which is capable of using individual channels working in a transmitting and receiving modes simultaneously. The device consists of a number of optical prisms combined into a single module and provided with appropriate dichroic mirrors and interferrometric filters located on the outer surfaces of the prisms. According to one embodiment of the invention, the module consists of two sequentially arranged parallelogram prisms, a single-channel signal input/output unit with an optical collimator/focusator on one side of the prism module and a two-channel signal output/input unit with a respective optical collimator/focusator on the other side of the prism module. The first prism, which is located on the single-channel side has a first antireflective coating transparent to all input/output signals (λ1, λ2, λ3) and a second coating located on the two-channel side of the first prism that reflects one optical signal (λ2) and passes the remaining two optical signals (λ1and λ3). Thus, the input/output signals of several different wavelengths can be multiplexed/demultiplexed while passing in a multi-bounce zigzag expanded beam light paths in various combinations of signal-propagation directions. A pair of prism modules described above may be built-into a section of the main signal transmission/reception line and the output side of each prism module may be connected to a respective bidirectional optical signal transceiver.
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Faibishenko Victor
Fedyakin Nikolai
Gurevich Igor
Kaku Shinkyo
Velikov Leonid
Allied Telesis Inc.
Cooley Godward Kronish LLP
Tran Dzung
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