Fabry-perot laser apparatus mode-locked to multi-frequency lasing light source and optical transmission apparatus using the same
First Claim
1. A Fabry-Perot (FP) laser apparatus mode-locked to a multi-frequency lasing light source as a light source for Wavelength Division Multiplexing WDM-based optical communications, comprising:
- an optical amplifier that amplifies inputted optical signals;
a laser light source that wavelength division demultiplexes a first part of the inputted optical signals, multiplexes the demultiplexed optical signals, re-transmits the multiplexed optical signals, wavelength division demultiplexes the remaining part of the amplified optical signals, and outputs signals mode-locked to the demultiplexed signals; and
a first circulator that inputs the remaining part of the amplified optical signals into the laser light source, and outputs, to an optical transmission link, optical signals mode-locked to the multi-frequency lasing light source outputted from the laser light source.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to Wavelength Division Multiplexing (WDM) based optical communications, and more particularly to an Fabry-Perot (FP) laser apparatus mode-locked to a multi-frequency lasing light source and an optical transmission apparatus using the same. An FP laser apparatus mode-locked to a multi-frequency lasing light source, comprises an optical amplifier that amplifies inputted optical signals, a laser light source that wavelength division demultiplexes part of the inputted optical signals, multiplexes the demultiplexed optical signals, re-transmits the multiplexed optical signals, wavelength division demultiplexes the remaining part of the amplified optical signals, and outputs signals mode-locked to the demultiplexed signals, and a first circulator that inputs the remaining part of the amplified optical signals into the laser light source, and outputs, to an optical transmission link, optical signals mode-locked to the multi-frequency lasing light source outputted from the laser light source.
25 Citations
17 Claims
-
1. A Fabry-Perot (FP) laser apparatus mode-locked to a multi-frequency lasing light source as a light source for Wavelength Division Multiplexing WDM-based optical communications, comprising:
-
an optical amplifier that amplifies inputted optical signals;
a laser light source that wavelength division demultiplexes a first part of the inputted optical signals, multiplexes the demultiplexed optical signals, re-transmits the multiplexed optical signals, wavelength division demultiplexes the remaining part of the amplified optical signals, and outputs signals mode-locked to the demultiplexed signals; and
a first circulator that inputs the remaining part of the amplified optical signals into the laser light source, and outputs, to an optical transmission link, optical signals mode-locked to the multi-frequency lasing light source outputted from the laser light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16, 17)
-
-
8. An optical transmission apparatus for transmitting upstream and downstream signals of a PON (Passive Optical Network) in which a central office, a remote node and a plurality of subscriber devices are connected through a transmission optical fiber, comprising:
-
the central office comprising a light source having FP lasers outputting signals for transmission that are mode-locked to multi-frequency lasing light and directly modulated based on downstream data, a circulator connected to the light source that downstream-transmits the signals mode-locked to the multi-frequency lasing light and directly modulated, and outputs optical signals for upstream-transmission from the remote node to the transmission optical fiber, a plurality of upstream optical receivers that receive the upstream-transmitted optical signals, a plurality of first wavelength division multiplexers/demultiplexers that multiplex/demultiplex input/output signals of the FP lasers and upstream channels for input into the upstream optical receivers, a pumping light source that outputs pumping light of a predetermined wavelength to drive the upstream multi-frequency lasing light source, and a second and third wavelength division multiplexers/demultiplexers that multiplexes/demultiplexes the upstream/downstream-transmitted signals and a pumping signal;
the remote node comprising a multi-frequency lasing light source having an N×
N waveguide grating router that demultiplexes the multiplexed downstream signals for transmission and the multi-frequency lasing light and multiplexes optical signals transmitted from the subscriber devices, anda fourth and fifth wavelength division multiplexer/demultiplexer that multiplexes/demultiplexes the upstream/downstream-transmitted signals and the pumping signal; and
the subscriber devices each comprising an FP laser that receives the optical signals transmitted from the remote node and outputs for transmission directly modulated mode-locked signals based on upstream data, a downstream optical receiver that receives downstream channel signals demultiplexed and transmitted by the remote node, and a sixth wavelength division multiplexer/demultiplexer that multiplexes/demultiplexes input/output signals of the FP laser and downstream channels for input into the downstream optical receiver. - View Dependent Claims (9, 10, 11, 12, 14)
-
-
13. The optical transmission apparatus of 10, wherein the third and fourth wavelength division multiplexer/demultiplexer are configured to pass signals of a passband of the first bandpass filter and a passband of the second bandpass filter and the pumping signal from the central office.
Specification