Dr. Navin Bhandarkar Profile

Dr. Navin Bhandarkar

at Photodigm Inc

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Proceedings Article | 11 March 2005 Paper

Low-cost CWDM transmitter package

Navin Bhandarkar, Jaime Castillega

Proceedings Volume 5731, (2005) https://doi.org/10.1117/12.589391

KEYWORDS: Transmitters, Multiplexers, Modulation, Laser welding, Fiber lasers, Coarse wavelength division multiplexing, Lenses, Multimode fibers, Laser bonding, Optical alignment

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A low-cost coarse-wavelength-division multiplexer (CWDM) transmitter that combines four channels (wavelengths) in the infrared spectrum (~1310 nm) in a small form-factor un-cooled package is demonstrated. The package utilizes precision molded optics to multiplex beams from four grating-outcoupled surface-emitting (GSE) lasers into a single beam suitable for coupling into multimode fiber. This paper summarizes the optical and opto-mechanical design, fabrication and assembly of prototypes, and optical, thermal and electrical measurement results of the prototypes. This unique design enables multiplexing of wavelengths without the use of filters, waveguides, couplers and fiber splicing. Commercial fabrication and alignment technology is used to manufacture the package, resulting in a more robust, reliable and low-cost transmitter. The transmitter package is enabled by the unique characteristics of the long-wavelength GSE laser.

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