Apparatus, system and methods for modifying operating characteristics of optoelectronic devices
View Patent ↗Systems, devices and methods are disclosed for adjusting the operating characteristic of an optical signal transmitted by an optoelectronic device based on the operational data rate, as is indicated by a ‘rate select’ signal. The rate select can be generated automatically, or can be transmitted from a host device. One example of an operating characteristic that can be adjusted is the optical modulation level of the transmitted signal.
1. An optical transceiver module, comprising:
an optical transmitter assembly including a laser device configured to produce an optical signal in response to a laser current;
a laser driver circuit configured to produce the laser current for use by the optical transmitter;
an optical receiver assembly; and
a controller circuit configured to receive a rate select signal that indicates a plurality of operational data rates for the optical transmitter assembly, and that is configured to generate at least one control signal for use by the laser driver circuit, wherein the at least one control signal causes a modulation light level of the optical signal to be set according to the operational data rate indicated by the rate select signal.
2. An optical transceiver module as defined in claim 1 , wherein the rate select signal is received from an external host device.
3. An optical transceiver module as defined in claim 1 , wherein the module is compatible with an operational data rate as dictated by at least one of: 2 gigabits per second Fibre Channel systems; 4 gigabits per second Fibre Channel systems; and Gigabit Ethernet.
4. An optical transceiver module as defined in claim 1 , wherein the module is compatible with an operational data rates greater than approximately 1 gigabits per second.
5. An optical transceiver module as defined in claim 1 , wherein the modulation light level is set at a level needed to satisfy a predefined Extinction Ratio (ER) level.
6. An optical transceiver module as defined in claim 1 , wherein the modulation light level is set at a level needed to satisfy a predefined Optical Modulation Amplitude (OMA) level.
7. An optical communications system, the system comprising:
a host device; and
an optical transceiver module as set forth in claim 1 .
8. An optical transceiver module as defined in claim 1 , wherein the rate select signal is generated by a detection circuit present within the optical transceiver module.
9. An optical transceiver module as defined in claim 8 , wherein the detection circuit comprises one of:
a clock and data recover integrated circuit;
a multiplexer/demultiplexer integrated circuit; and
a serializer/deserializer integrated circuit.
10. An optical transceiver module as defined in claim 1 , wherein the modulation light level caused to be set according to the operational data rate is a first modulation light level and wherein the at least one control signal causes a second modulation light level to be set according to the operational data rate, the first and second modulation light levels corresponding to first and second logic levels in the optical signal, respectively.
11. An optical transceiver module as defined in claim 10 , wherein the first and second modulation light levels are caused to be set such that a difference between the modulation light levels meets an optical modulation level requirement associated with the operational data rate.
12. An optical transceiver module, comprising:
an optical transmitter assembly including a laser device configured to produce an optical signal in response to a laser current that is representative of information in an electrical signal;
a laser driver circuit having a first input to receive the electrical signal and a second input to receive a control signal, the laser driver circuit being configured to produce the laser current for use by the optical transmitter in response to the electrical signal;
an optical receiver assembly; and
a controller circuit configured to receive a rate select signal that indicates one of a plurality of operational data rates for the optical transmitter assembly,
wherein the controller circuit is configured to generate the control signal and wherein the control signal controls the laser driver circuit to cause a modulation light level of the optical signal to be set according to the operational data rate indicated by the rate select signal.
13. An optical transceiver module as defined in claim 12 , wherein the rate select signal is received from a source external to the optical transceiver module.