Coherent light generators – Particular active media – Semiconductor
Patent
1995-04-20
1997-03-18
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 20, H01S 310
Patent
active
056129688
ABSTRACT:
A semiconductor integrated-circuit laser array including redundant lasers that is particularly useful in a wavelength-division multiplexed communication system requiring N channels regularly spaced in wavelength. According to a first aspect of the invention, a plurality of lasers are designed to operate at the same wavelength so that a single inoperative laser will not prevent the laser array from operating. Further, sets of lasers are chosen which have wavelength spacings closest to the design spacing. According to a second aspect of the invention, the laser array includes lasers with spacings in between the design wavelengths. Thereby, if all the lasers systematically vary in wavelength, a set of lasers can be selected that will operate not far from their nominal operating wavelength.
REFERENCES:
patent: 5515391 (1996-05-01), Endriz
Zah et al., "Multiwavelength light source with integrated DFB laser array and star coupler for WDM lightwave communications," International Journal of High Speed Electronics and Systems, vol. 5, No. 1, 1994, pp. 91-109 (No Month).
Zah et al., "Monolithic integrated multiwavelength laser arrays for WDM lightwave systems," Optoelectronics--Devices and Technologies, vol. 9, No. 2, 1994, Jun.
Green, Jr., Fiber Optics Networks, (Prentice-Hall, 1993), pp. 200-204, 353-391 (No Month).
Brackett et al., "A scalable multiwavelength multihop optical network: A proposal for research on all-optical networks," Journal of Lightwave Technology, vol. 11, 1993, pp. 736-753 May/Jun.
Bell Communications Research Inc.
Davie James W.
Falk James W.
Giordano Joseph
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