Bi-directional transceiver with time synchronization

• US 10,211,971 B2
• Filed: 08/30/2017
• Issued: 02/19/2019
• Est. Priority Date: 08/30/2016
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Miao, Puhui, Shu, Huade, Lin, Leo Yu-yu
• Primary Examiner(s): Jacob, Oommen
• Application Number:
  US15/691,425
• Publication Number:
  US 20180062825A1
• Time in Patent Office: 538 Days
• Field of Search: 398 34, 398 25, 398 9, 398 1
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/25753 Distribution optical network, e.g. between a base station and a plurality of remote units
• CPC Class Codes: H04B 10/2589 Bidirectional transmission
• CPC Class Codes: H04B 10/564 Power control
• CPC Class Codes: H04J 14/0202 Arrangements therefor
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0278 WDM optical network architectures
• CPC Class Codes: H04J 3/0641 Change of the master or reference, e.g. take-over or failure of the master
• CPC Class Codes: H04J 3/0667 Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays arrangements for monitoring round trip delays in packet switching networks H04L43/0864
• CPC Class Codes: H04L 7/0075 with photonic or optical means

Abstract

A system or a network may include an optoelectronic module that includes an optical transmitter optically coupled with an optical fiber, and a controller communicatively coupled to the optical transmitter. The controller may be configured to operate the optical transmitter to transmit data signals through the optical fiber. The optoelectronic module may be configured to transmit time synchronization signals through the optical fiber along with the data signals.

Claims

1. A system comprising:

an optoelectronic module comprising;

an optical transmitter; and

a controller communicatively coupled to the optical transmitter, the controller configured to operate the optical transmitter to transmit data signals through an optical fiber, the controller comprising;

a power and extinction ratio (ER) control module, the power and ER control module configured to modulate the amplitude of the signals emitted by the optical transmitter to combine data signals with time synchronization signals;

an input stage configured to receive one or more time synchronization inputs; and

a driver that receives data input signals and drives the optical transmitter and

wherein the optoelectronic module is configured to transmit the time synchronization signals through the optical fiber along with the data signals.

2. The system of claim 1, further comprising an optical multiplexer or demultiplexer optically coupled between the optoelectronic module and the optical fiber.

3. The system of claim 1, wherein the optical fiber is a bidirectional optical fiber.

4. The system of claim 1, wherein the system is a bidirectional dense wavelength division multiplexing system or a bidirectional colorless system, and the system is configured to transmit data signals and time synchronization signals in a first direction and an opposite second direction through the optical fiber.

5. The system of claim 1, wherein the controller amplitude modulates the time synchronization signals to be transmitted over the optical fiber along with the data signals.

6. The system of claim 1, the optoelectronic module further comprising a time synchronization signal detection module configured to receive received time synchronization signals from the optical fiber.

7. The system of claim 6, wherein the received time synchronization signals are amplitude modulated and are received along with received data signals.

8. The system of claim 1, the optoelectronic module further comprising:

an optical receiver optically coupled to receive optical signals from the optical fiber;

a time synchronization signal detection module configured to detect time synchronization signals received through the optical fiber and output time synchronization output signals.

9. The system of claim 1, the optoelectronic module further comprising:

a time synchronization signal detection module comprising;

an amplifier;

a low pass filter coupled to the amplifier; and

a limiting amplifier coupled to the low pass filter.

11. The system of claim 1, wherein the optical transmitter is one or more of:

a directly modulated optical transmitter;

a tunable laser with an external modulator;

a tunable laser with a Mach-Zehnder modulator; and

a tunable laser with an electro-absorption modulator.

14. The system of claim 1, the optoelectronic module further comprising:

a second optical transmitter optically coupled with the optical fiber; and

a second controller communicatively coupled to the optical transmitter, the controller configured to operate the second optical transmitter to transmit the time synchronization signals through the optical fiber along with the data signals.

10. An optoelectronic module comprising:

an optical transmitter optically coupled to an optical fiber;

a power controller comprising;

a power and extinction ratio (ER) control module; and

a driver that receives data input signals; and

a wavelength controller comprising;

an input stage configured to receive one or more time synchronization inputs;

a temperature and wavelength control module configured to change the frequency or wavelength of signals emitted by the optical transmitter to transmit time synchronization signals over the optical fiber along with the data signals.

12. An optoelectronic module comprising:

a tunable filter optically coupled to an optical fiber; and

a time synchronization signal detection module comprising;

a limiting amplifier;

a mark-space-ratio detector coupled to the limiting amplifier; and

a filter controller coupled to the mark-space-ratio detector, the filter controller configured to control the tunable filter; and

a monitor photodiode optically coupled to the tunable filter, the monitor photodiode electrically coupled to the limiting amplifier.

13. The optoelectronic module of claim 12, further comprising a splitter configured to direct a portion of optical signals to the monitor photodiode via the tunable filter.

15. An optoelectronic module comprising:

an optical transmitter;

a controller communicatively coupled to the optical transmitter, the controller configured to operate the optical transmitter to transmit data signals through an optical fiber;

an optical receiver optically coupled with the optical fiber, the optical receiver configured to receive time synchronization signals from the optical fiber;

a time synchronization signal detection module communicatively coupled to the optical receiver;

a splitter optically coupled between the optical transmitter and the optical fiber, and optically coupled between the optical receiver and the optical fiber, the splitter configured to;

direct the transmitted time synchronization signals from the optical transmitter to the optical fiber; and

direct the received time synchronization signals from the optical fiber to the optical receiver;

wherein the transmitted time synchronization signals and the received time synchronization signals include the same wavelength or different wavelengths.