A system and method for generating soft decision reliability information from hard decisions in an optical signal receiver. The receiver may include a digital signal processor including a symbol reliability function for generating symbol reliability information associated with symbols encoded on optical signal. The symbol reliability information may be generated as a function of the symbols and hard decision outputs associated with the symbols.
System And Method Including Modified Bit-Interleaved Coded Modulation
A system and method with a modified bit-interleaved coded modulation with iterative decoding (BICM-ID). Coded and interleaved bits are combined and coded with a second FEC code that is then mapped to a modulation format. The second FEC code may be a single parity check (SPC) and the scheme may be referred to as a SPC-BICM-ID scheme.
System And Method Including Modified Bit-Interleaved Coded Modulation With Fractional Secondary Coding
A system and method with a modified bit-interleaved coded modulation with iterative decoding (BICM-ID). A first group of coded and interleaved bits are coded with a second FEC code and a second group of coded and interleaved bits are not coded with the second FEC code. The first and second groups are then mapped to a modulation format. The second FEC code may be a single parity check (SPC) and the scheme may be referred to as a BICM-ID scheme with a fractional secondary coding.
Fiber Sensing Using Supervisory Path Of Submarine Cables
- Princeton NJ, US Ezra IP - West Windsor NJ, US Hussam BATSHON - Monroe NJ, US Eduardo Mateo RODRIGUEZ - Tokyo, JP Kohei NAKAMURA - Tokyo, JP Takanori INOUE - Tokyo, JP Yoshihisa INADA - Tokyo, JP
Assignee:
NEC LABORATORIES AMERICA, INC - Princeton NJ
International Classification:
G01V 1/00 H04B 10/25 G01V 1/22
Abstract:
Earthquake detection via fiber sensing is provided using using a supervisory path of submarine cables wherein the supervisory system/path of a submarine optical cable conveys portion(s) of an optical signal back to an origin location periodically—i.e., at every repeater location. Advantageously, since it is known where a returning signal is coming from, a resolution equivalent to an undersea span length may be determined—which is sufficient for wide area disturbances such as earthquakes. The returned signal is sufficiently strong such that the signal-to-noise ratio of a returned/received signal is not limited by the ASE noise of the amplifiers. The returned signal is much larger as compared to a normal distributed acoustic sensing (DAS) return signal since the return signal according to aspects of the present disclosure is directed backward via an optical coupler/reflector/circulator having a much larger coupling ratio as compared to normal Rayleigh back scattering utilized in DAS.
Accurate Measurement For Guided Acoustic-Wave Brillouin Scattering
- Princeton NJ, US Eduardo Mateo RODRIGUEZ - Tokyo, JP Shinsuke FUJISAWA - Princeton NJ, US Hussam BATSHON - Monroe NJ, US Kohei NAKAMURA - Tokyo, JP Takanori INOUE - Tokyo, JP Yoshihisa INADA - Tokyo, JP Takaaki OGATA - Tokyo, JP
Assignee:
NEC LABORATORIES AMERICA, INC - Princeton NJ NEC Corporation - Tokyo
Aspects of the present disclosure are directed to systems, methods, and structures providing for the accurate measurement of guided acoustic-wave Brillouin scattering in optical fiber transmission systems and facilities.
Estimating Core-Cladding Concentricity Error In Optical Fibers Using Guided Acoustic-Wave Brillouin Scattering
- Princeton NJ, US Hussam BATSHON - Monroe NJ, US Shinsuke FUJISAWA - Princeton NJ, US Kohei NAKAMURA - Tokyo, JP Takanori INOUE - Tokyo, JP Eduardo Mateo RODRIGUEZ - Tokyo, JP Yoshihisa INADA - Tokyo, JP
Assignee:
NEC LABORATORIES AMERICA, INC - PRINCETON NJ NEC Corporation - Tokyo
International Classification:
G01B 11/27 G01M 11/00
Abstract:
Aspects of the present disclosure describe estimating/measuring core-cladding concentricity error in optical fibers. In sharp contrast to the prior art, our inventive method is based on measuring a seemingly unrelated property of fibers called guided acoustic wave Brillouin scattering (GAWBS). As we shall show and describe, by analyzing this GAWBS property we advantageously determine what level of CCCE is exhibited by the optical fiber.
Integrated 3-Way Branching Unit Switch Module Having Small Footprint
- PRINCETON NJ, US Shinsuke FUJISAWA - PRINCETON NJ, US Hussam BATSHON - Monroe NJ, US Takigawa YOSHINARI - TOKYO, JP Ryuji AIDA - Tokyo, JP Takanori INOUE - Tokyo, JP Eduardo Rodriguez - TOKYO, JP Yoshihisa INADA - TOKYO, JP
Assignee:
NEC LABORATORIES AMERICA, INC - PRINCETON NJ
International Classification:
H04J 14/02 G02B 6/44
Abstract:
Aspects of the present disclosure describe systems, methods. and structures directed to an integrated 3-way branching unit switch module suitable for undersea application.
Spatial Division Multiplexing In Limited Power Optical Communication Systems
- Eatontown NJ, US Oleg V. Sinkin - Long Branch NJ, US Georg Mohs - East Brunswick NJ, US Hussam G. Batshon - Neptune NJ, US Neal S. Bergano - Lincroft NJ, US
International Classification:
H04B 10/564 H04B 10/2581 H04J 14/02
Abstract:
This spatial division multiplexing (SDM) in power-limited optical communication systems. In general, an SDM optical transmission system may be configured to increase data capacity over the data capacity of a non-SDM optical transmission system while maintaining power consumption at or below that of the existing non-SDM optical transmission system. To realize such an improvement in performance without increasing power consumption, an example SDM optical transmission may be constructed by reducing system bandwidth, reducing and/or altering equipment for filtering, reducing optical amplifier spacing, reducing operational amplifier power consumption, etc. In this manner, increased data transmission performance may be realized even where available power may be strictly limited.