WDM-PON ARCHITECTURE BASED ON EXTERNALLY SEEDED OPTICAL SOURCE

• US 20110188859A1
• Filed: 03/31/2009
• Published: 08/04/2011
• Est. Priority Date: 03/31/2008
• Status: Abandoned Application

• Current Assignee: Agency For Science Technology and Research (Government of Singapore)
• Original Assignee: Agency For Science Technology and Research (Government of Singapore)
• Inventors: Wen, Yang Jing, Wang, Yixin, Xu, Zhaowen, Cheng, Xiaofei
• Application Number:
  US12/935,419
• Publication Number:
  US 20110188859A1
• Time in Patent Office: Days
• US Class Current: 398/79
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/02216 by gain equalization
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

A wavelength-division-multiplexed passive optical network (WDM PON) comprising: a remote node (RN) comprising a light source for generating a seeding signal; and one or more optical network units (ONUs), each ONU comprising a laser source configured for receiving a portion of the seeding light signal from the RN.

Claims

1. A wavelength-division-multiplexed passive optical network (WDM PON) comprising:

a remote node (RN) comprising a light source for generating a seeding signal; and

one or more optical network units (ONUs), each ONU comprising a laser source configured for receiving a portion of the seeding light signal from the RN.

2. The WDM PON as claimed in claim 1, wherein the light source comprises a circulator and an erbium doped fiber (EDF) coupled between two adjacent ports of the circulator.

3. The WDM PON as claimed in claim 2, wherein one port of the circulator is configured for receiving an optical signal comprising a pump signal for the EDF and downlink signals and for circulating the received optical signal to the EDF.

4. The WDM PON as claimed in claim 3, wherein another port of the circulator is configured for receiving uplink signals from the ONUs and for circulating the uplink signals to said one port for uplink transmission from the remote node.

5. The WDM PON as claimed in claim 4, wherein the circulator comprises a non-full circulator, and an optical fiber is coupled between adjacent blocked ports disposed between said another and said one port.

6. The WDM PON as claimed in claim 4, wherein said another port is configured for transmission of the down link signals and the seeding signal from the EDF.

7. The WDM PON as claimed in claim 1, wherein the light source comprises an erbium doped fiber (EDF) coupled between first and second couplers.

8. The WDM PON as claimed in claim 7, wherein the first coupler comprises a WDM coupler configured for receiving an optical signal comprising a pump signal for the EDF and downlink signals and for transmitting the pump signal to the EDF and for transmitting the downlink signals to the second coupler for combining with the seeding signal for transmission to the ONUs.

9. The WDM PON as claimed in claim 1, wherein the laser source comprises a Fabry-Perot laser diode (FPLD).

10. The WDM PON as claimed in claim 1, wherein the laser source comprises a reflective semiconductor optical amplifier (RSOA).

11. The WDM PON as claimed in claim 1, further comprising a central office comprising a pump source for the light source of the remote node.

12. A method of externally seeding an uplink light source in an optical network unit of a wavelength-division-multiplexed passive optical network (WDM PON), the method comprising generating a seeding signal at a remote node of the WDM PON.