Modular optical device with mixed signal interface
A controller for optical components. A controller includes mixed signal interface that is configured to connect to an optical component external to the controller. The mixed signal interface is able to deliver and/or receive signals to and/or from the optical component. The controller includes a digital interface that is able to connect to a memory external to the controller. The digital interface may receive a digital representation of operating characteristics of the optical component. The controller is configured to deliver and/or receive signals to and/or from the optical component based on the digital representation of operating characteristics.
1. An optical module comprising:
a laser;
a memory module comprising a digital representation of operating characteristics of the laser and digital diagnostic parameters including setup, eye safety, fault detection, and temperature compensation;
a digital interface coupled to the memory module, the digital interface configured to allow an external digital device to retrieve the digital representation of the operating characteristics of the laser;
a mixed signal interface coupled to the laser, the mixed signal interface configured to receive a modulation signal and one or more bias signals from a driving source external to the optical module for driving the laser, the modulation signal and the one or more bias signals being based on the digital representation of the operating characteristics of the laser including operating characteristics of the laser observed upon fabrication of the laser and identification information of the laser; and
a modulator circuit internal to the optical module configured to receive at least one of the one or more bias signals and to operate in saturation mode to remove channel effects and jitter in the modulation signal.
2. The optical module of claim 1 , wherein the digital representation of the operating characteristics comprises a correlation of current running through the laser to optical power output by the laser.
3. The optical module of claim 1 , wherein the digital representation of the operating characteristics comprises a correlation of current running through the laser and temperature of the laser to optical power output by the laser.
4. The optical module of claim 1 , wherein the digital representation of the operating characteristics comprises expansion coefficients.
5. The optical module of claim 4 , wherein the expansion coefficients are a Legendre polynomial.
6. The optical module of claim 1 , wherein the digital representation of the operating characteristics comprises end points of a curve.
7. The optical module of claim 1 , wherein the digital representation of the operating characteristics comprises an endpoint and slope of a curve.
8. The optical module of claim 1 , the memory module further comprising digital diagnostic parameters including at least one of: identification, monitoring, power on time, and margining.
9. The optical module of claim 8 , wherein at least a portion of the digital diagnostic parameters is updateable by a host device.
10. 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 configured to be accessible to a controller external to the optical module.
11. The optical module of claim 1 , wherein the modulation signal is a digital signal and the mixed signal interface comprises a second digital interface configured to receive the digital modulation signal.
12. The optical module of claim 1 , further comprising a clamping circuit coupled to the laser, the clamping circuit being configured to limit an output power of the laser.
13. The optical module of claim 12 , wherein the clamping circuit is configured to limit the output power of the laser to within predetermined eye safety limits.
14. The optical module of claim 1 , wherein the at least one of the one or more bias signals is configured to bias the modulator circuit.
15. An optical module comprising:
a laser;
a clamping circuit including a zener diode coupled in a parallel configuration with respect to the laser, the clamping circuit being configured to limit an output power of the laser;
a photosensitive device configured to receive an optical signal 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 signal;
an analog interface coupled to the transimpedance amplifier and configured to deliver the analog electrical signal to an external controller;
a memory module comprising a digital representation of operating characteristics of the laser and the photosensitive device and digital diagnostic parameters including setup, eye safety, fault detection, and temperature compensation;
a digital interface coupled to the memory module, the digital interface configured to allow an external digital device to retrieve the operating characteristics of the laser and the photosensitive device;
a mixed signal interface coupled to the laser, the mixed signal interface configured to receive a modulation signal and one or more bias signals from a driving source external to the optical module for driving the laser, the modulation signal and the one or more bias signals being based on the digital representation of the operating characteristics of the laser including operating characteristics of the laser observed upon fabrication of the laser and identification information of the laser; and
a modulator circuit internal to the optical module configured to receive at least one of the one or more bias signals and operate in saturation mode to remove channel effects and jitter in the modulation signal.