Widely wavelength tunable integrated semiconductor device and method for widely wavelength tuning semiconductor devices
View Patent ↗Alternative laser structures, which have potentially the same tuning performance as (S)SG-DBR and GCSR lasers, and a fabrication process which is similar to that of the (S)SG-DBR laser, are presented. The advantage of these structures is that the output power does not pass through a long passive region.
1. A widely tunable laser apparatus comprising:
a substrate comprising a semiconductor material;
at least two resonator sections formed on the substrate, wherein each of the at least two resonator sections comprise one of a transmission filter and a reflector; and
a two-sided active radiation-generating section formed on the substrate, the at least two resonator sections being coupled with a single side of the two-sided active section,
wherein each of the at least two resonator sections comprises a waveguide system, each waveguide system operatively having spaced resonant maxima points, so as to provide one of a maximum transmittance and a maximum reflectance when subjected to energy of a frequency corresponding with one of the resonant maxima points, and
wherein at least two spacings of the plurality of resonant maxima points are differently spaced in the frequency domain for at least two of the resonant sections.
2. The apparatus of claim 1 , wherein the spacing of the plurality of resonant maxima points in the frequency domain is different for at least two of the resonator sections.
3. The apparatus of claim 1 , wherein, at least one of the resonant maxima points of each of the at least two resonator sections are adjustably overlapping.
4. The apparatus of claim 1 , wherein the active section creates a light beam as a result of spontaneous emission over a bandwidth around a center frequency and guides the light beam.
5. The apparatus of claim 1 , wherein the active section creates a light beam as a result of spontaneous emission over a bandwidth around a center frequency and optically amplifies the light beam.
6. The apparatus of claim 5 , wherein the apparatus produces a combined reflective action and the optical amplification causes lasing at at least one of the wavelengths associated with one of the reflective maxima points.
7. The apparatus of claim 1 , further comprising a power splitter for coupling one or more of the at least two resonator sections with the active section.
8. The apparatus of claim 7 , wherein the power splitter is coupled with the active section via a first side of the power splitter having a single port and coupled with the at least two resonator sections via a second side of the power splitter having a plurality of parallel connections.
9. The apparatus of claim 1 , wherein only a single resonant maxima point of each of the at least two resonator sections overlap.
10. The apparatus of claim 1 , further comprising one or more phase control sections coupled with at least the active section for adjusting a round trip cavity phase of the apparatus.
11. The apparatus of claim 1 , further comprising one or more phase control sections coupled with at least one of said two resonator sections for adjusting a round trip cavity phase of the apparatus.
12. The apparatus as recited in claim 1 , further comprising a current source coupled with the at least two resonator sections for injecting current into one or more of the at least two resonator sections, so as to cause one of a transmission characteristic and a reflection characteristic to be shifted in wavelength.
13. The apparatus of claim 1 , further comprising one or more phase control sections coupled with one of the active section and the at least two resonator sections, wherein the phase control sections are employed to adjust a round trip cavity phase of the apparatus.
14. The apparatus as recited in claim 13 , further comprising a current source coupled with the one or more phase sections for injecting current into one or more of the phase sections, so as to cause the roundtrip cavity phase of the apparatus to be adjusted.