Superimposed grating wdm tunable lasers

Details Superimposed grating wdm tunable lasers Superimposed grating wdm tunable lasers

H - Electricity

01

S

H01S 3/10 (2006.01) H01S 5/0625 (2006.01) H01S 5/125 (2006.01) H01S 5/12 (2006.01)

Patent

CA 2228683

A superimposed grating tunable WDM semiconductor laser is provided comprising a grating structure is a binary superimposed grating comprising a plurality of segments of equal dimension, s, each segment having one of two values of refractive index, whereby the grating structure is provided by a binary modulation of the refractive index modulation of segments s along the length of the grating. Thus, for a superimposed grating structure for an optoelectronic device for providing a spectrum comprising j reflection peaks at wavelengths .lambda. j, the grating comprising a binary superimposed grating (BSG) having a sequence of a plurality of segments of equal size s, each segment of the sequence having a refractive index of one of two values wherein the effective waveguide index of the ith segment n~(.lambda.) is allowed to be changed by .DELTA.n~(m-1/2) with m=1 or m=0: Image where i=1,2,3... is the segment number, for digital position i~s, n o(.lambda.) is a waveguide effective index, including both waveguide and material dispersion, and the function f(x) is a weighted sum of sinusoidal functions of desirable period A j f(x)=~(a j sin(2.pi.x/~ j)) and, periods ~ j relate to the spectral positions of reflection peaks .lambda. j through the waveguide index n o(.lambda.) ~ j = .lambda. j/2n o(.lambda. j) Thus each grating is defined in a truly binary fashion as a digitized binary representation of elements providing a sum of component functions. The structure is readily fabricated by electron beam lithography at normal resolution. The ease of fabrication makes this structure desirable for front and back reflectors for tunable WDM lasers for applications such as tunable lasers for telecommunications applications and provides for an extended tuning range with excellent performance characteristics.

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