摘要:
An electrostatic discharge (ESD) protected semiconductor device. The semiconductor device is formed as a monolithic structure. The monolithic structure includes a vertical cavity surface emitting laser (VCSEL) and a protection diode. The protection diode cathode is electrically coupled to the VCSEL anode and the protection diode anode is electrically coupled to the VCSEL cathode so as to provide ESD protection to the VCSEL.
摘要:
Monolithic opto-isolators and arrays of monolithic opto-isolators are disclosed. The monolithic opto-isolators are manufactured in a single semiconductor wafer where they may be tested at the wafer level before each opto-isolator is singulated from the wafer. The monolithic opto-isolators include a VCSEL monolithically produced adjacent to a photodiode where an axis of optical signal transmission of the VCSEL is substantially parallel to an axis of optical signal reception by the photodiode.
摘要:
An optical structure that reduces the effects of spontaneous emissions from the active region of a laser. An optical structure includes optimizations to reduce the effects of spontaneous emissions. The optical structure includes a VCSEL with top and bottom DBR mirrors and an active region connected to the mirrors. The optical structure further includes a photodiode connected to the VCSEL. One or more optimizations may be included in the optical structure including optically absorbing materials, varying the geometry of the structure to change reflective angles, using optical apertures, changing the reflectivity of one or more mirrors, changing the photodiode to be more impervious to spontaneous emissions, and using ion implants to reduce photoluminescence efficiency.
摘要:
The present invention relates to controlling parameters of an optical output of an optical transmitter. An optical package can be selected based on a level of attenuation of a parameter of a transmitter output by the optical package. The laser and the optical package can be assembled and a parameter of the transmitter output can be measured. An optical barrel can be selected based on the measurement, wherein the optical barrel is selected based on an attenuation level to satisfy a range of a desired parameter value. The optical package and the optical barrel can be assembled. A system for assembling the optical device is also described.
摘要:
A system and method for VCSEL (vertical cavity surface emitting laser) polarization control is disclosed, including methods and apparatus comprising a component package (302, 304) having self-aligning features (316, 318), for indicating an alignment axis (320, 322), and an upper surface aperture (314) formed therein, a vertical cavity surface emitting laser device (308) having two emission polarizations (204) normal to one another, disposed within the component package and aligned such that each emission polarization is at about 45 degrees with respect to the alignment axis, and a linear polarization element (400, 402, 406) having a polarization direction (206), spanning the aperture and disposed such that the polarization direction is parallel to the alignment axis.
摘要:
Methods and apparatus for monitoring the power level of a multi-wavelength optical signal are provided. Also provided are methods and apparatus for adjusting the power level of selected optical emitters to compensate for the changes in power levels.
摘要:
Embodiments of the present invention provide a system for increasing an operational life of a VCSEL. The system can include control circuitry for reducing an amount of bias current at high temperatures and increasing a power of the laser at low temperatures. This control circuitry can further include at least one of a temperature sensor, a Field Programmable Gate Array, a read only memory module, and an electrically erasable programmable read only memory module (EEPROM). In alternate embodiments, the control circuitry can further include a lookup table that sets the bias current depending on a temperature of the laser. The laser can be part of an optoelectronic transceiver module which can include, by way of example and not limitation, SFP, XFP, X2, XAUI, XENPAK, XPAK, GBIC, 8G, 16G, and other optoelectronic modules.
摘要:
Monolithic opto-isolators and arrays of monolithic opto-isolators are disclosed. The monolithic opto-isolators are manufactured in a single semiconductor wafer where they may be tested at the wafer level before each opto-isolator is singulated from the wafer. The monolithic opto-isolators include a VCSEL monolithically produced adjacent to a photodiode where an axis of optical signal transmission of the VCSEL is substantially parallel to an axis of optical signal reception by the photodiode.
摘要:
A photodiode and a method of fabricating a photodiode for reducing modal dispersion and increasing travel distance. The central region of the photodiode is made less responsive to incident light than a peripheral region of the photodiode. The less responsive central region discriminates the lower order modes such that only the higher order modes are incident on the more responsive peripheral region. Because the lower order modes are subtracted, the range of propagation constants is reduced and modal dispersion is also reduced.
摘要:
Methods and apparatus for alignment of TO cans with photodiodes on fiber-optic receptacles. The methods and apparatus make use of direct connections to photodiodes or connections to Received Signal Strength Indicator (RSSI) outputs to align TO cans in fiber-optic receptacles. An optical source, such as a laser diode, can be powered by a low-frequency or DC source. This optical source can direct light into the fiber-optic receptacle. The TO can is manipulated in a barrel of the fiber-optic receptacle. The current through the photodiode or the RSSI output is monitored to determine when light directed into the photodiode is at a maximum or above a predetermined threshold. The TO can is fixed in the barrel when the light directed into the photodiode is at the maximum or predetermined threshold.