Michael Frank Cina

A compact multichannel transceiver module using planar-processed optical waveguides and flip-chip optoelectronic components

A compact, planar-processed package using flip-chip, self-aligned optoelectronic components is described. The packaging concepts are compatible with existing high-speed, high-density electronic materials and processes and therefore have the potential for high-volume, low-cost manufacturing. The concepts are demonstrated using a four-channel transceiver module utilizing planar-processed optical waveguides and flip-chip optoelectronic components. An overview of the package is presented, and the substrate, the optoelectronic chip alignment, the module connector, and link tests are described.<<ETX>>

Passive laser-fiber alignment by index method

A method for packaging a laser-fiber module was explored in which the critical laser-fiber alignment is carried out not with the usual active means, i.e., with the laser activated, but by a passive method based on the registration principles of photolithography. The method relies on an index scheme in which fiducial marks are lithographically placed on the laser chip and on a fiber carrier. At 850 nm, using the index technique with cleaved multimode fibers, it was possible to achieve the same laser-fiber coupling efficiency as attained by active alignment; with cleaved single-mode fibers about 80% of the active-alignment coupling efficiency was achieved.<<ETX>>

Packaging of high-density fiber/laser modules using passive alignment techniques

A novel method for packaging a laser-fiber module is explored in which the critical laser-fiber alignment is carried out not with the usual active means, i.e., with the laser activated, but by a passive method based on the registration principles of photolithography. The novel method relies on an index scheme in which fiducial marks are lithographically placed on the laser chip and on a fiber carrier. At 850 nm, using the index technique with cleaved multimode fibers, it has been possible to achieve the same laser-fiber coupling efficiency as attained by active alignment; with cleaved single-mode fibers about 80% of the active-alignment coupling efficiency was achieved. Details of the novel index-alignment method are discussed, and a brief description of an improved computer-controlled version of the apparatus is given.<<ETX>>

Optical Fiber Coupling Approaches For Multi-Channel Laser And Detector Arrays

Two fiber-optic coupling approaches are described for providing accurate and simultaneous alignment between four multimode fibers and a four-channel GaAs laser and detector array. The fiber-detector array coupling approach provides less than 0.2 dB loss with better than -20 dB optical crosstalk between adjacent channels. The fiber-laser array coupling approach provides -3 dB coupling loss for each of four fiber-laser channels.