Multiplex, Inc.

Liang David Tzeng

Won-Tien Tsang

Tawee Tanbun-Ek

Kang-Yih Liou

An optical transponder/transceiver for intermediate range (e.g., 10-50 km) optical communication applications utilizes an electroabsorption modulated laser for the transmitting device. Preferably, the laser operations at a wavelength of approximately 1310 nm and comprises an electroabsorption modulated Fabry-Perot laser.

Optical transponders and transceivers

In one aspect, the invention relates to a waveguide structure for differential transmission lines. The waveguide structure includes a first ground structure, a first signal line, a second ground structure, a second signal line, a third ground structure. The first signal line is typically positioned adjacent and substantially parallel to the first ground structure. The second ground structure has a first separation distance from the first ground structure and is typically positioned adjacent and substantially parallel to the first signal line. The first signal line is typically positioned between both the first and second ground structures. The second signal line typically a has a second separation distance from the first signal line and is positioned adjacent and substantially parallel to the second ground structure. The second ground structure is typically positioned between both the first and second signal lines. The third ground structure typically has a third separation distance from the second ground structure and is positioned adjacent and substantially parallel to the second signal line. The second signal line is typically positioned between both the second and third ground structures.

Differential transmission line for high bandwidth signals

An electroabsorption modulated laser (EML) is formed to include a Fabry-Perot lasing section, in place of the conventional DFB lasing section. When operated at a wavelength of 1310 nm, the wider spectral bandwidth of the FP device (containing several longitudinal modes) is of no concern, since 1310 nm is the zero dispersion wavelength of most conventional transmission fibers. A selective area growth process is used to simultaneously form the MQW active regions of both the FP and EA sections of the EML device, and an isolation trench may be formed between the sections to reduce the effects of electrical crosstalk.

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Belle Mead, NJ, United States of America

Liang David Tzeng