Optical waveguides – With optical coupler – Input/output coupler
Patent
1998-07-13
2000-01-11
Ngo, Hung N.
Optical waveguides
With optical coupler
Input/output coupler
385 34, 385140, G02B 634, G02B 632
Patent
active
060144858
ABSTRACT:
Optical filters, filter systems, and methods for filtering optical signals transmitted along optical fibers provide enhanced filter performance by combining the capabilities of different types of filters particularly for dense wavelength division multiplexed systems. More specifically, the spectral skirt or transition wavelength range between a pass band wavelength range and a blocked wavelength range of a thin film pass band or dichroic filter is enhanced by arranging the thin film filter in series with one or more Fiber Bragg Gratings. The Fiber Bragg Gratings will generally reflect a portion of the signal within the spectral skirt or transition wavelength range of the thin film filter. Although short Fiber Bragg Gratings generally block a quite narrow range of signals, the steep spectral skirt of the grating, when combined with the broader wavelength response of a thin film bandpass or dichroic filter, results in a composite filter structure which exhibits the beneficial characteristics of each of its components.
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Wyatt et al., "10kHz Linewidth 1.5 .mu.m InGaAsP External Cavity Laser With 55 nm Tuning Range", Electronics Letters, 19:3 (Feb. 3, 1983), pp. 110-112 .
E-Tek Dynamics, Inc.
Ngo Hung N.
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