Patent ID: 7277462

Claim:
A tuneable laser assembly comprising: a substrate having formed thereon a plurality of tuneable lasers including distributed Bragg reflector (DBR) tuning sections, said lasers having respective emission wavelengths and tuning ranges such that said laser assembly can be tuned over a quasi-continuous predetermined wavelength range, a plurality of waveguides coupled to said lasers to receive therefrom said respective emission wavelengths, an optical coupler coupled to said waveguides to receive via said waveguides said emissions wavelengths from said lasers, and an optical amplifier coupled to said coupler to amplify said emission wavelengths coupled via said optical coupler, wherein four of said plurality of lasers have Bragg wavelengths at zero tuning current of 1535 nm, 1545 nm, 1555 nm and 1565 nm, respectively.