Wavelength stabilizer for TWDM-PON burst mode DBR laser

• US 9,281,899 B2
• Filed: 10/14/2014
• Issued: 03/08/2016
• Est. Priority Date: 10/14/2013
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Feng, Yan, Xuejin, Gao, Bo, Effenberger, Frank
• Primary Examiner(s): Jacob, Oommen
• Application Number:
  US14/514,080
• Publication Number:
  US 20150104179A1
• Time in Patent Office: 511 Days
• Field of Search: 398/81, 398/193, 398/79, 398/43, 398/196
• US Class Current: 1/1
• CPC Class Codes: H01S 5/02251 using optical fibres
• CPC Class Codes: H01S 5/02415 by using a thermo-electric cooler [TEC], e.g. Peltier element
• CPC Class Codes: H01S 5/06216 Pulse modulation or generation
• CPC Class Codes: H01S 5/06256 with DBR-structure
• CPC Class Codes: H01S 5/06804 by monitoring an external parameter, e.g. temperature
• CPC Class Codes: H01S 5/0687 Stabilising the frequency of the laser
• CPC Class Codes: H04B 10/07955 Monitoring or measuring power
• CPC Class Codes: H04B 10/503 Laser transmitters
• CPC Class Codes: H04B 10/50575 to control the modulator DC bias
• CPC Class Codes: H04B 10/564 Power control
• CPC Class Codes: H04B 10/572 Wavelength control
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0223 Conversion to or from optical TDM
• CPC Class Codes: H04J 14/0278 WDM optical network architectures
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

An optical network unit (ONU) comprising a media access controller (MAC) configured to support biasing a laser transmitter to compensate for temperature related wavelength drift receiving a transmission timing instruction from an optical network control node, obtaining transmission power information for the laser transmitter, estimating a burst mode time period for the laser transmitter according to the transmission timing instruction, and calculating a laser phase fine tuning compensation value for the laser transmitter according to the burst mode time period and the transmission power information, and forwarding the laser phase fine tuning compensation value toward a bias controller to support biasing a phase of the laser transmitter.

Claims

1. An optical component comprising:

a laser transmitter configured to transmit an optical signal;

a media access controller (MAC) coupled to the laser transmitter, wherein the MAC is configured to support biasing a laser transmitter to compensate for temperature related wavelength drift by;

receiving a transmission timing instruction from an optical network control node;

obtaining transmission power information for the laser transmitter;

estimating a burst mode time period for the laser transmitter according to the transmission timing instruction;

calculating a laser phase fine tuning compensation value for the laser transmitter according to the burst mode time period and the transmission power information; and

forwarding the laser phase fine tuning compensation value toward a bias controller to support biasing a phase of the optical signal of the laser transmitter.

2. The optical component of claim 1 further comprising:

the bias controller coupled to the laser transmitter and the MAC and configured to;

receive the laser phase fine tuning compensation value from the MAC; and

bias the laser transmitter according to the laser phase fine tuning compensation value.

3. The optical component of claim 2, wherein obtaining the transmission power information for the laser transmitter comprises:

receiving a digital measurement of current of the laser transmitter from an optical power monitor photodiode; and

converting the digital measurement of current to the transmission power information.

4. The optical component of claim 2, wherein the laser phase fine tuning compensation value comprises a laser phase fine tuning current curve that indicates a profile of compensation current to be injected into the laser transmitter by the bias controller to bias the phase of the optical signal of the laser transmitter.

5. The optical component of claim 2, wherein biasing the laser transmitter according to the laser fine tuning compensation value causes a blue-shift in the laser transmitter such that the blue-shift compensates for a red-shift in the laser transmitter caused by increased temperature associated transmission burst length.

6. The optical component of claim 2, wherein the optical component is configured to couple to a time and wavelength division multiplexed passive optical network (TWDM-PON).

7. A method of biasing a laser transmitter to compensate for temperature related wavelength drift implemented in an optical device, wherein the method comprises:

receiving a transmission timing instruction from an optical line terminal (OLT), wherein the transmission timing instruction indicates a timeslot for an upstream transmission by the laser transmitter;

estimating a laser transmitter burst mode time period based on the timeslot;

calculating transmission power information based on a measurement of current associated with the laser transmitter;

calculating an amount of injection current to be used for biasing a phase of an optical signal of the laser transmitter based on the calculated transmission power information and the estimated burst mode time period; and

biasing the laser transmitter to compensate for temperature related wavelength drift by injecting the calculated injection current into an input of a Distributed Bragg Reflector (DBR) laser gain section of the laser transmitter concurrently with data input.

8. The method of claim 7, wherein the temperature related wavelength drift is associated with output of the laser transmitter and is a red-shift caused by increased temperature associated with transmission burst length.

9. The method of claim 8, wherein the calculated injection current varies proportionally to the transmission burst length.

10. The method of claim 8, wherein biasing the phase of the optical signal of the laser transmitter generates a blue-shift in the output of the laser transmitter, and wherein the blue-shift approximately cancels the red-shift such that the output of the laser transmitter is within 0.1 nanometers (nm) of a preferred output value.

11. The method of claim 7, wherein the measurement of current is a real-time measurement via an optical power monitor photodiode coupled to the laser transmitter.

12. The method of claim 7, wherein the optical device is an optical network unit (ONU) configured to couple to a time and wavelength division multiplexed passive optical network (TWDM-PON).

13. The method of claim 7, wherein the optical device is an optical network terminal (ONT) configured to couple to a time and wavelength division multiplexed passive optical network (TWDM-PON).