The patent's assignee for patent application serial number 346254 is
News editors obtained the following quote from the background information supplied by the inventors: "Embodiments of the present invention relate to optoelectronic modules and in particular to multi-source transmitters in optoelectronic modules.
"Optoelectronic modules, such as optoelectronic transceiver or transponder modules, are increasingly used in electronic and optoelectronic communication. The modules may be designed specifically for certain applications or modularly for compatibility with a variety of host networking equipment. Modular modules typically follow multi-source agreements, such as the C Form-factor Pluggable and the Quad Small Form-factor Pluggable multi-source agreements that specify housing dimensions for modules, among other things. Conformity with a multi-source agreement allows a module to be plugged into host equipment designed in compliance with the multi-source agreement.
"Modules typically communicate with a printed circuit board of a host device by transmitting electrical signals to the printed circuit board and receiving electrical signals from the printed circuit board. The received electrical signals may be transmitted by the module out of the host device as optical signals.
"Optical signals may be generated within a transmitter optical subassembly (TOSA) of a module using a laser, such as a vertical cavity surface emitting laser, distributed feedback laser, or another type of laser. As data rates in modules increase, two or more lasers are often included in a single TOSA to handle the increase. However, as multi-source agreements specify increasingly smaller module housing dimensions, there is less available space for multi-laser TOSAs within module housings. In addition, multi-laser TOSAs are often relatively expensive and often suffer from relatively high optical loss.
"The subject matter claimed herein is not limited to embodiments that solve any disadvantages or that operate only in environments such as those described above. Rather, this background is only provided to illustrate one exemplary technology area where some embodiments described herein may be practiced"
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In general, example embodiments relate to multi-laser transmitter optical subassemblies (TOSAs) for optoelectronic modules. At least some example multi-laser TOSAs disclosed herein exhibit a relatively low size, cost, and optical loss, thus enabling relatively improved overall performance of the optoelectronic modules into which the TOSAs are integrated.
"In some embodiments, a TOSA may include two lasers, each laser configured to generate an optical signal with a unique wavelength. The TOSA may further include a focusing lens and a filter assembly that combines the optical signals into a combined optical signal that is received by the focusing lens. The filter assembly may include a filter that passes one optical signal and reflects another optical signal based on the wavelengths of the optical signals. The filter may be a low pass filter or a high pass filter and have a cutoff wavelength between the wavelengths of the optical signals. In some embodiments, the TOSA may further include an isolator between the filter and the focusing lens and collimating lenses between the lasers and the filter assembly.
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