Integrated wired and wireless WDM PON apparatus using mode-locked light source

• US 20060182446A1
• Filed: 02/17/2006
• Published: 08/17/2006
• Est. Priority Date: 02/17/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hwang, Seong-Taek, Lee, Kwan-Soo, Shim, Chang-Sup, Kim, Yong-Gyoo
• Application Number:
  US11/357,640
• Publication Number:
  US 20060182446A1
• Time in Patent Office: Days
• US Class Current: 398/72
• CPC Class Codes: H04B 10/25752 Optical arrangements for wireless networks
• CPC Class Codes: H04B 10/296 Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0226 Fixed carrier allocation, e.g. according to service
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/025 using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 2014/0253 Allocation of downstream wavelengths for upstream transmission

Abstract

Integrated wired and wireless wavelength division multiplexing passive optical network (WDM PON) apparatus using a light source mode-locked to fed incoherent light includes: a fed light generator for providing fed light for up/downstream signals via a broadband light source emitting an incoherent optical signal; a central office (CO) for receiving, mode-locking, and downstream-optical-transmitting the incoherent optical signal generated by the fed light generator and receiving and optical-detecting an upstream optical signal transmitted from a subscriber unit; and the subscriber unit for receiving, mode-locking, and upstream-optical-transmitting the incoherent optical signal generated by the fed light generator and receiving and optical-detecting a downstream optical signal transmitted from the CO, wherein a wired optical transmitter for transmitting a baseband wired signal and a wireless optical transmitter for transmitting a high frequency radio frequency (RF) signal are comprised for up/downstream optical transmission of the CO and the subscriber unit.

Claims

1. A wavelength division multiplexing passive optical network (WDM PON) apparatus using a light source mode-locked to fed incoherent light, the apparatus comprising:

a fed light generator for providing fed light for up/downstream signals using a broadband light source emitting an incoherent optical signal;

a central office (CO) for receiving, mode-locking and downstream-optical-transmitting the incoherent optical signal generated by the fed light generator and for receiving and optical-detecting an upstream optical signal transmitted from a subscriber unit;

the subscriber unit for receiving, mode-locking, and upstream-optical-transmitting the incoherent optical signal generated by the fed light generator and for receiving and optical-detecting a downstream optical signal transmitted from the CO; and

a wired optical transmitter for transmitting a baseband wired signal and a wireless optical transmitter for transmitting a high frequency radio frequency (RF) signal, the wired and wireless optical transmitters are for up/downstream optical transmission of the CO and the subscriber unit.

2. The WDM PON apparatus of claim 1, wherein the wireless optical transmitter comprises:

a Fabry-Perot laser diode (FP-LD) receiving the incoherent optical signal and outputting a mode-locked light source; and

an electro-absorption modulator (EAM) for optical modulating a high frequency RF signal on the mode-locked light source input from the FP-LD.

3. A system for downstream optical transmission in a wavelength division multiplexing passive optical network (WDM PON) apparatus using a light source mode-locked to fed incoherent light, the system comprising:

a broadband light source (BLS) for outputting an incoherent optical signal used as fed light;

an optical path module for setting paths of the incoherent optical signal input from the BLS and up/downstream optical signals;

a first arrayed waveguide (AWG) for demultiplexing the incoherent optical signal input through the optical path module and transmitting the demultiplexed incoherent optical signals to a plurality of wired/wireless optical transmitters, and multiplexing optical modulation signals received from the plurality of wired/wireless optical transmitters;

the plurality of wired optical transmitters, each for receiving the demultiplexed incoherent optical signal from the first AWG, mode-locking the demultiplexed incoherent optical signal for downstream transmission, and optical-modulating the mode-locked incoherent optical signal to carry baseband wired signal data;

the plurality of wireless optical transmitters, each for receiving the demultiplexed incoherent optical signal from the first AWG, mode-locking the demultiplexed incoherent optical signal for downstream transmission, and optical-modulating the mode-locked incoherent optical signal to carry high frequency radio frequency (RF) signal data;

a second AWG for demultiplexing the multiplexed downstream optical signal received from the first AWG in a wavelength basis; and

optical receivers for subscribers for optical-detecting the demultiplexed downstream optical signals received from the second AWG.

4. The system of claim 3, wherein each of the plurality of wireless optical transmitters comprises:

an FP-LD for receiving the demultiplexed incoherent optical signal from the first AWG and outputting a mode-locked light source for the downstream transmission; and

an EAM for performing optical modulation to carry high frequency RF signal data on the mode-locked light source of the FP-LD.

5. The system of claim 4, wherein a high reflection (HR) coating is applied to the FP-LD, and an anti-reflection (AR) coating is applied to the EAM.

6. The system of claim 3, wherein each of the plurality of wired optical transmitters comprises an FP-LD.

7. The system of claim 3, wherein each of the plurality of wired optical transmitters comprises a reflective semiconductor optical amplifier (R-SOA).

8. A system for upstream optical transmission in a wavelength division multiplexing passive optical network (WDM PON) apparatus using a light source mode-locked to fed incoherent light, the system comprising:

a broadband light source (BLS) for outputting an incoherent optical signal used as fed light;

an optical path module for setting paths of the incoherent optical signal input from the BLS and up/downstream optical signals;

a first arrayed waveguide (AWG) for demultiplexing the incoherent optical signal input through the optical path module and multiplexing optical modulation signals received from a plurality of wired/wireless optical transmitters;

the plurality of wired optical transmitters, each for receiving the incoherent optical signal demultiplexed by the first AWG;

mode-locking the demultiplexed incoherent optical signal for upstream transmission, and optical-modulating the mode-locked incoherent optical signal to carry baseband wired signal data;

the plurality of wireless optical transmitters, each for receiving the demultiplexed incoherent optical signal from the first AWG, mode-locking the demultiplexed incoherent optical signal for upstream transmission, and optical-modulating the mode-locked incoherent optical signal to carry high frequency radio frequency (RF) signal data;

a second AWG for demultiplexing the multiplexed upstream optical signal received from the first AWG in a wavelength basis; and

optical receivers for subscribers for optical-detecting the demultiplexed upstream optical signals received from the second AWG

9. The system of claim 8, wherein each of the plurality of wireless optical transmitters comprises an FP electro-absorption modulated laser (FP-EML) comprising:

an FP-LD for receiving the demultiplexed incoherent optical signal from the first AWG and outputting a mode-locked light source for the upstream transmission; and

an EAM for performing optical modulation to carry high frequency RF signal data for the upstream transmission on the mode-locked light source of the FP-LD.

10. The system of claim 9, wherein a high reflection (HR) coating is applied to the FP-LD, and an anti-reflection (AR) coating is applied to the EAM.

11. The system of claim 8, wherein each of the plurality of wired optical transmitters comprises an FP-LD.

12. The system of claim 8, wherein each of the plurality of wired optical transmitters comprises a reflective semiconductor optical amplifier (R-SOA).