Optical network unit, wavelength splitter, and optical...

Details Optical network unit, wavelength splitter, and optical... Optical network unit, wavelength splitter, and optical...

2007-04-10

2007-04-10

Phan, Hanh (Department: 2613)

Optical communications

Multiplex

Broadcast and distribution system

C398S066000, C398S067000, C398S068000, C398S069000, C398S070000, C398S071000, C398S073000, C398S079000, C398S100000, C398S082000, C398S084000, C398S085000, C398S087000, C385S024000, C385S037000, C385S042000, C385S050000

Reexamination Certificate

active

10744641

ABSTRACT:
In an optical wavelength division multiplexed access system, a center unit (OSU) and n optical network units (ONUs) are connected together via a wavelength splitter and optical fiber transmission lines, and downstream optical signals from the OSU to the ONUs and upstream optical signals from the ONUs to the OSU are transmitted in both directions, the wavelength spacing Δλd (optical frequency spacing Δfd) of the downstream optical signals is set to twice or more the wavelength spacing Δλu (optical frequency spacing Δfu) of the upstream optical signals, each ONU transmits an upstream optical signal whose optical spectral width is twice or more Δλu (Δfu), and the wavelength splitter spectrum slices the upstream signals transmitted from the ONUs into wavelengths (optical frequencies) whose optical spectral widths are mutually different within Δλu (Δfu), and wavelength-division multiplexes them and transmits to the OSU.

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