A device for producing laser light at different optical wavelengths, comprising: an array of tunable lasers to produce laser light at different optical wavelengths, respectively, each tunable laser including: a tunable sampled Bragg grating reflector responsive to an electrical control signal to produce tunable reflectivity peaks within a tunable spectral range, a second grating reflector that is spaced from the sampled Bragg grating reflector to form an optical resonator with the sampled Bragg grating reflector and configured to produce reflectivity peaks at different second grating reflector resonance wavelengths within the tunable spectral range of the tunable sampled Bragg grating reflector, and a gain section between the tunable sampled Bragg grating reflector and the second grating reflector, the gain section capable of being electrically energized to produce an optical gain for the laser light at a respective optical wavelength produced by the tunable laser; wherein the sampled Bragg grating reflector of a tunable laser in the array has a different grating pitch than that of the other tunable lasers in the array, so that each tunable laser produces laser light at a respective optical wavelength which is different from the optical wavelengths of the other tunable lasers in the array, and a laser control unit electrically coupled to the tunable lasers by a common electrical connection to apply the electrical control signal as a common control signal to the tunable sampled Bragg grating reflector in each of the tunable lasers to synchronously tune the tunable lasers that operate the different optical wavelengths, respectively, wherein the device is configured to tune each tunable laser at a coarse step of n X Δf, where n is the number of the tunable lasers in the array of tunable lasers and Δf is the channel spacing between the different optical wavelengths of the tunable lasers in the array. an array of tunable lasers to produce laser light at different optical wavelengths, respectively, each tunable laser including: a tunable sampled Bragg grating reflector responsive to an electrical control signal to produce tunable reflectivity peaks within a tunable spectral range, a second grating reflector that is spaced from the sampled Bragg grating reflector to form an optical resonator with the sampled Bragg grating reflector and configured to produce reflectivity peaks at different second grating reflector resonance wavelengths within the tunable spectral range of the tunable sampled Bragg grating reflector, and a gain section between the tunable sampled Bragg grating reflector and the second grating reflector, the gain section capable of being electrically energized to produce an optical gain for the laser light at a respective optical wavelength produced by the tunable laser; a tunable sampled Bragg grating reflector responsive to an electrical control signal to produce tunable reflectivity peaks within a tunable spectral range, a second grating reflector that is spaced from the sampled Bragg grating reflector to form an optical resonator with the sampled Bragg grating reflector and configured to produce reflectivity peaks at different second grating reflector resonance wavelengths within the tunable spectral range of the tunable sampled Bragg grating reflector, and a gain section between the tunable sampled Bragg grating reflector and the second grating reflector, the gain section capable of being electrically energized to produce an optical gain for the laser light at a respective optical wavelength produced by the tunable laser; wherein the sampled Bragg grating reflector of a tunable laser in the array has a different grating pitch than that of the other tunable lasers in the array, so that each tunable laser produces laser light at a respective optical wavelength which is different from the optical wavelengths of the other tunable lasers in the array, and a laser control unit electrically coupled to the tunable lasers by a common electrical connection to apply the electrical control signal as a common control signal to the tunable sampled Bragg grating reflector in each of the tunable lasers to synchronously tune the tunable lasers that operate the different optical wavelengths, respectively, wherein the device is configured to tune each tunable laser at a coarse step of n X Δf, where n is the number of the tunable lasers in the array of tunable lasers and Δf is the channel spacing between the different optical wavelengths of the tunable lasers in the array.