Auto-setting and optimization of EAM with optical line systems

• US 6,970,652 B2
• Filed: 10/22/2002
• Issued: 11/29/2005
• Est. Priority Date: 12/07/2001
• Status: Active Grant

• Current Assignee: Oplink Communications, LLC (KOCH Industries Incorporated)
• Original Assignee: Oplink Communications
• Inventors: Shi, Feng, Fu, Xiaoli, Zhang, Genzao, Wang, Tongqing, Li, Jinghui
• Primary Examiner(s): Sedighian, M. R.
• Assistant Examiner(s): Bello, Agustin
• Application Number:
  US10/277,204
• Publication Number:
  US 20040208514A1
• Time in Patent Office: 1,134 Days
• Field of Search: 359124-140, 359/154, 359/159, 359/161, 359/173, 359/174, 359/179, 359/187, 359/188
• US Class Current: 398/162
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/07953 Monitoring or measuring OSNR, BER or Q
• CPC Class Codes: H04B 10/0799 Monitoring line transmitter or line receiver equipment

Abstract

According to the invention there is provided a method of controlling an optical communication system comprising an optical transmitter, an optical receiver and an optical fiber interconnecting the optical transmitter and the optical receiver, the method comprising determining the performance of the optical communication system and controlling at least one setting parameter of the optical transmitter according to the measured performance.

Claims

1. An optical communication system comprising an optical transmitter, the optical transmitter having a Driver Amplifier (DA) configured to provide a modulated Radio Frequency output signal to an optical modulator, an optical receiver, an optical fibre interconnecting the optical transmitter and the optical receiver, and a controller electrically coupled to the receiver and electrically coupled to the transmitter to supply a control signal thereto, the controller having means for receiving raw system performance information (RSPI) and means for processing the RSPI from which at least one performance indication parameter (PIP) is derived and controlling at least one setting parameter of the DA according to the processing of the RSPI, the controller further configured to enter an idle mode, an auto-setting mode and a dynamic control mode;

wherein the at least one setting parameter is used to control characteristics of the modulated RF signal output of the DA,

and wherein in the auto-setting mode, the controller is configured to implement a speed search stage, a fine tune stage and a setting decision stage.

2. An optical communication system according to claim 1, wherein in the speed search stage, the controller is configured for deciding upon a search range of the at least one setting parameter, calculating a plurality of search points, setting at least one setting parameter, determining the performance of the system and calculating the fine tune range.

3. An optical communication system according to claim 1, wherein in the fine tune stage the controller is configured for increasing the search resolution based on the fine tune range, followed setting the at least one setting parameter, determining the performance of the system, generating a decision range from the performance and calculating final decision range.

4. An optical communication system according to claim 1, wherein in the dynamic control mode, the controller is configured for performing the following steps:

i. incrementally changing the at least one setting parameter of the optical transmitter according to a prediction algorithm;

ii. measuring a revised RSPI based on the incrementally changed setting parameter;

iii. calculating at least one revised PIP based on the revised RSPI;

iv. building at least one PIP matrix from multiple cycles of steps i., ii., and iii;

v. adjusting the at least one setting parameter based on the at least one PIP matrix;

vi. repeating steps (4, (ii), (iii), (iv) and (v) until an indication is received by the controller for the dynamic control mode to stop.

5. An optical communication system comprising an optical transmitter, the optical transmitter having a Driver Amplifier (DA), an optical receiver an optical fibre interconnecting the optical transmitter and the optical receiver, and a controller electrically coupled receiver and electrically coupled to the transmitter to supply a control signal thereto, the controller having means for receiving raw system performance information (RSPI) and means for processing the RSPI from which at least one performance indication parameter (PIP) is derived and controlling at least one setting parameter of the DA according to the processing of the RSPI;

wherein the at least one setting parameter is used to control characteristics of an output of the DA;

wherein the controller is configured to enter an idle mode, an auto-setting mode and a dynamic control mode; and

wherein in the the auto-setting mode, the controller is configured for implementing a speed search stage, a fine tune stage, and a setting decision stage.

6. An optical communications system according to claim 5, wherein in the speed search stage, the controller is configured for deciding upon a search range of the at least one setting parameter, calculating a plurality of search points, setting at least one setting parameter, determining the performance of the system and calculating the fine tune range.

7. An optical communications system according to claim 5, wherein in the fine tune stage the controller is configured for increasing the search resolution based on the fine tune range, followed setting the at least one setting parameter, determining the performance of the system, generating a decision range from the performance and calculating final decision range.

8. An optical communications system according to claim 5, wherein in the dynamic control mode the controller is configured for implementing the following steps:

i. incrementally changing the at least one setting parameter of the optical transmitter according to a prediction algorithm;

ii. measuring a revised RSPI based on the incrementally changed setting parameter;

iii. calculating at least one revised PIP based on the revised RSPI;

iv. building at least one PIP matrix from multiple cycles of steps i., ii., and iii;

v. adjusting the at least one setting parameter based on the at least one PIP matrix;

vi. repeating steps (i), (ii), (iii), (iv) and (v) until an indication is received by the controller for the dynamic control mode to stop.