Configuring optical launch powers in optical fiber...

Details Configuring optical launch powers in optical fiber... Configuring optical launch powers in optical fiber...

2008-05-27

2008-05-27

Wood, Kevin S. (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

C385S122000, C385S147000

Reexamination Certificate

active

07379647

ABSTRACT:
A method includes transmitting optical signals through a heterogeneous sequence of spans of an all-optical transmission line. Each span has an optical transmission fiber connected to an optical amplifier. Each amplifier launches the signals into a sequential remainder of the line. The transmitting includes launching the optical signals into the highest loss fibers with substantially equal average optical launch powers or operating the spans with the highest loss fibers to have substantially equal quality products. The average optical launch powers are substantially equal to the inverse of a sum of (1−Tj)γj/[φNL·αj] over the highest loss fibers. The parameters Tj, γj, and αjare the respectiveare, respectively, transmissivity, nonlinear optical coefficient, and loss coefficient of the fiber of the j-th span. The parameter φNLis the line's cumulative nonlinear phase shift. Each quality product is the per-span optical signal-to-noise ratio of the associated span times the nonlinear phase shift of the associated span.

REFERENCES:
patent: 2004/0234272 (2004-11-01), Chowdhury et al.
patent: 2006/0051039 (2006-03-01), Wei
E. Ng, “Cost-Saving Opportunity for the MAN - DCM and Amplifier Placement for Metro Optical Networks”,OFC 2003/vol. 2, Mar. 27, 2003,pp. 481-482.

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