Laser and detector using integrated reflector for photonic integration

Integrable Slotted Single-Mode Lasers

“…An exception is the slotted laser reported in [6][7][8][9][10][11][12][13]. These lasers use optical defects in a standard Fabry-Pérot (FP) laser to specifically select a single mode, and such optical defects are formed by etching around 1 µm wide slots into the top ridge of the laser waveguide.…”

“…However, because it needs two cleaved facets it cannot be employed to integrate monolithically with other optical devices. Another is the high-order distributed Bragg reflector (DBR) laser type [12,13], where the slots are introduced into one side of the laser cavity to provide the full feedback for lasing. This type of laser is made completely dependent on slots.…”

“…Because in this way the fundamental FP cavity is removed, the strong background reflection from the FP cavity facets disappears, which means that the laser can be integrated with other photonic devices such as electro-absorption (EA) modulators and mode converters, and that the laser can potentially work over a wide temperature range while keeping high side mode suppression ratio (SMSR). In [13] a laser based on the very deep slots has been demonstrated to integrate with a photodiode, however, this laser suffered from a low SMSR due to the broad reflection bandwidth caused by the small number of deep slots. By optimizing the slot width, depth and period, we predicted in theory that single mode lasers can be made completely dependent on such slots at one end of the laser cavity and in such case the laser is suitable for photonic integration [14].…”

A Tunable Semiconductor Lased Based on Etched Slots Suitable for Monolithic Integration

“…The single slot laser is fabricated by etching into the waveguide of the FP laser diode as described in (DeChiaro 1991;McDonald & Corbett 1996;Fessant & Boucher 1998;Klehr, Beister et al 2001;Lambkin, Percival et al 2004;Engelstaedter, Roycroft et al 2008). The slots act as reflection centres and produce a modulation of the reflection and transmission spectra dependent on the characteristics of the www.intechopen.com slot such as slot position, slot depth to which it is etched and slot width.…”

Discretely Tunable Semiconductor Lasers Suitable for Photonic Integration

“…An array of such slots can provide the necessary reflectivity for the laser operation independent of a cleaved facet where the gain between the slots compensates for the slot loss producing an active slotted mirror region. Such a mirror has been used in conjunction with a cleaved facet permitting the integration of a photodetector with the laser [14].…”