Modular optical device that interfaces with an external controller
View Patent ↗Optical modules described herein include optical components such as lasers or photodiodes for communicating on fiber-optic networks. The lasers and photodiodes have analog interface such that the lasers and photodiodes can be controlled by a controller external to the optical modules. The optical modules also include memory modules. The memory modules store operating characteristics of the lasers and photodiodes. The operating characteristics can be read via digital interfaces that are connected to the memory modules. This allows the controller to appropriately adjust signals such that a randomly selected controller may be used with a randomly selected optical module.
1. An optical module comprising:
a laser;
an analog interface coupled to the laser, the analog interface configured to receive electrical signals from a controller external to the optical module for driving the laser;
a memory module in which is stored a digital representation of operating characteristics of the laser and digital diagnostic parameters including setup, eye safety, fault detection, temperature compensation, power on time and margining; and
a digital interface coupled to the memory module, the digital interface configured to allow the external controller to retrieve the digital representation of operating characteristics of the laser,
wherein the digital representation of operating characteristics comprises a correlation of a linear portion of each of a plurality of laser current to optical power curves each corresponding to a different laser operating temperature, the linear portion being above a threshold amount of laser current.
2. The optical module of claim 1 , wherein the digital representation of operating characteristics comprises end points of a curve.
3. The optical module of claim 1 , wherein the digital representation of operating characteristics comprises an endpoint and slope of a curve.
4. The optical module of claim 1 , wherein the digital diagnostic parameters further include at least one of identification and monitoring.
5. The optical module of claim 4 , wherein at least a portion of the digital diagnostic parameters is updateable by a host device.
6. The optical module of claim 1 further comprising:
a monitor photodiode optically coupled to the laser; and
a feedback interface coupled to the monitor photodiode and accessible to a controller external to the optical module.
7. A system comprising the optical module of claim 1 and a controller that is externally coupled to the optical module and that controls operation of the optical module,
wherein the controller is adapted to deliver and/or receive signals to and/or from the optical module based on the digital representation of operating characteristics,
wherein the optical module is one of a plurality of types of optical modules, and
wherein the controller is adapted to deliver and/or receive signals complying with one of multiple standards and/or protocols to and/or from the optical module depending on the optical module type.
8. An optical module comprising:
a photosensitive device adapted to receive optical signals from a fiber-optic network;
a transimpedance amplifier coupled to the photosensitive device, the transimpedance amplifier configured to produce an analog electrical signal corresponding to the optical signals;
an analog interface coupled to the transimpedance amplifier configured to deliver the electrical signal to an external controller;
a memory module comprising:
a digital representation of operating characteristics of the photosensitive device; and
digital diagnostic parameters including identification, monitoring, power on time and margining; and
a digital interface coupled to the memory module, the digital interface configured to allow the external controller to retrieve the digital representation of operating characteristics of the photosensitive device and to adapt a post amplifier in the controller in dependence on the retrieved operating characteristics.
9. The optical module of claim 8 wherein the digital representation of operating characteristics comprises a correlation of current generated in the photosensitive device to optical power received by the photosensitive device.
10. The optical module of claim 8 wherein the digital representation of operating characteristics comprises a correlation of current generated in the photosensitive device and temperature of the photosensitive device to optical power received by the photosensitive device.
11. The optical module of claim 8 wherein the digital representation of operating characteristics comprises expansion coefficients.
12. The optical module of claim 11 , wherein the expansion coefficients are a Legendre polynomial.
13. The optical module of claim 8 wherein the digital representation of operating characteristics comprises end points of a curve.
14. The optical module of claim 8 , wherein the digital representation of operating characteristics comprises an endpoint and slope of a curve.
15. The optical module of claim 8 , wherein the digital diagnostic parameters further include at least one of setup, eye safety, fault detection, and temperature compensation.
16. The optical module of claim 15 , wherein at least a portion of the digital diagnostic parameters is updateable by a host device.
17. The optical module of claim 8 , wherein the photosensitive device is a photodiode.
18. An optical module comprising:
a laser;
a first analog interface coupled to the laser, the first analog interface configured to receive electrical signals from a controller external to the optical module for driving the laser;
a photosensitive device adapted to receive optical signals from a fiber-optic network;
a transimpedance amplifier coupled to the photosensitive device, the transimpedance amplifier configured to produce an analog electrical signal corresponding to the optical signals;
a second analog interface coupled to the transimpedance amplifier configured to deliver the electrical signal to the external controller;
a memory module in which is stored:
a digital representation of operating characteristics of the laser and the photosensitive device; and
digital diagnostic parameters including setup, identification, eye safety, fault detection, temperature compensation, monitoring, power on time and margining; and
a digital interface coupled to the memory module, the digital interface configured to allow the external controller to retrieve the operating characteristics of the laser and the photosensitive device and to adapt a laser driver in the controller and a post amplifier in the controller in dependence on the retrieved operating characteristics,
wherein the digital representation of operating characteristics comprises a correlation of a linear portion of each of a plurality of laser current to optical power curves each corresponding to a different laser operating temperature, the linear portion being above a threshold amount of laser current.
19. The optical module of claim 18 , wherein the digital representation of operating characteristics comprises expansion coefficients.
20. The optical module of claim 18 , wherein the digital representation of operating characteristics comprises a Legendre polynomial.
21. The optical module of claim 18 wherein the digital representation of operating characteristics comprises end points of a curve.
22. The optical module of claim 18 , wherein the digital representation of operating characteristics comprises an endpoint and slope of a curve.
23. The optical module of claim 18 , wherein at least a portion of the digital diagnostic parameters is updateable by a host device.
24. A system comprising the optical module of claim 18 and a controller that is externally coupled to the optical module and that controls operation of the optical module,
wherein the controller is adapted to deliver driving signals to the laser based on the digital representation of operating characteristics of the laser and wherein the controller is a universal controller adapted to recognize a protocol of received data and to comply with the recognized protocol when driving the delivered driving signals to the laser module.