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A four-port bandpass filter is demonstrated with good performance by use of UV-induced Bragg gratings in P-doped channel waveguides without UV trimming. The simple, single-step fabrication procedure is experimentally and theoretically analyzed, and tolerances are calculated for achieving practical wavelength-division-multiplexed communication system performance.

Beryllium (Be) diffusion into the active layers of single quantum well separate confinement heterostructure lasers grown by molecular beam epitaxy is investigated using photoluminescence absorption spectroscopy, secondary ion mass spectroscopy, capacitance–voltage profiling, and laser threshold current measurements. A significant amount of Be diffusion occurs under normal growth conditions. Large concentrations of Be in the quantum well are correlated to the lack of an exciton feature in the absorption spectrum. The amount of Be in the active region is reduced through a combination of lower Be concentration and lower growth temperature in the upper cladding region of the laser.

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We demonstrate an integrated fiber-photonic crystal system with a uniform band gap of around 1550 nm with insertion loss as low as 3.5 dB. One-dimensional photonic crystals fabricated on this platform exhibit a higher-order photonic band gap with over 30 dB suppression of transmission from 1400 to 1700 nm that is consistent with simulation. These results may lead to true integration of photonic crystals into optical fiber communication systems as optical switches and routers.