Multiwavelength locker integrated wide-band wavelength-selectable light source module

Optical Phase-Locking and Wavelength Synthesis

“…Signal frequency control in today's optical systems resembles that of pre-1970's RF/wireless systems. In wavelength-division multiplexed (WDM) links [2], channel frequencies and spacings are controlled by sets of optical resonators [3], while receivers separate wavelength channels using optical filters [4]. To accommodate laser and filter tuning errors, channel spacings must exceed modulation bandwidths.…”

Fabrication of Butt-Coupled SGDBR Laser Integrated with Semiconductor Optical Amplifier Having a Lateral Tapered Waveguide

“…Future applications may include use in wavelength routing and switching architectures. In some cases, output powers as high as 10 dBm are desired [1]. However, this has been difficult to achieve simultaneously with wide tunability.…”

“…Suppressing laser oscillation and wavelength-dependent undesirable amplification is required over the whole wavelength range of operation. The most popular approach has been single-layer AR coating with any combination of a tilted waveguide [1], window region [3], and tilted active region [4]. And recently, a wide bandwidth of about 50 nm (for R < 1 × 10 -4 ) using a twolayer AR coating of TiO 2 and SiO 2 was reported for 1.3 µm InGaAsP multi quantum well (MQW) SOA devices [5].…”

Fabrication of Tunable Sampled Grating DBR Laser Integrated Monolithically with Optical Semiconductor Amplifier Using Planar Buried Heterostructure

“…Widely and rapidly tunable laser diodes are promising components as high-speed light source for networks and optical switching applications. In some case, output powers as high as 10 mW are desired, 1) though this may be difficult to achieve simultaneously with wide tunability. A significant advantage of the sampled-grating (SG) DBR laser over other widely tunable lasers is that it can be monolithically integrated with different devices such as semiconductor optical amplifiers (SOA) and electroabsorption modulators.…”

“…A significant advantage of the sampled-grating (SG) DBR laser over other widely tunable lasers is that it can be monolithically integrated with different devices such as semiconductor optical amplifiers (SOA) and electroabsorption modulators. 1,2) Recently SGDBR lasers integrated with SOA have been studied and published by some groups who have adopted the structures of ridge waveguide (RWG) 3) and buried ridge stripe (BRS) 2,4) to take advantage of the simple fabrication process and the flexibility of integration. The structures of RWG, however, are known to be less effective than the planar buried heterostructure (PBH) in achieving the low threshold current and the stable fundamental transverse mode, mainly due to a low current confinement and weak index guiding.…”