an optical tunable laser design for the optical telecommunication industry is disclosed in this invention . this new design is economical , reliable , robust and with superior optical performances . the design offers broadband tunability , high output power , narrow laser line - width and high smsr . and in addition , the tunable laser is distinguishable from conventional designs by the mere facts that there are no moving parts , therefore , making it very reliable , and the tuning method of this invention is non - thermal and non - mechanical making its tuning very fast in the sub - millisecond range . in the manufacturing front , it is low cost and easy to produce . it can be achieved with automation equipment like those used in the ic placement and pc assembly industry , therefore , the products as that disclosed in this invention can be provided with significantly reduced production costs and marketed with very competitive price .