Patent ID: 11929592
Assignee: MARVELL ASIA PTE LTD
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 0:
1. A passthrough semiconductor optical amplifier configured to amplify laser light generated by a laser for data communication, the passthrough semiconductor optical amplifier being downstream from the laser and comprising:
a front facet having a first anti-reflective coating, a first reflectance less than or equal to 0.005%, and configured to receive the laser light from the laser;
a back facet having a second anti-reflective coating and a second reflectance less than or equal to 0.005%, the first anti-reflective coating and the second anti-reflective coating allowing the laser light to pass through the passthrough semiconductor optical amplifier once and be amplified by the passthrough semiconductor optical amplifier; and
a first gain medium i) extending from the front facet to the back facet, ii) in combination with the front facet and the back facet exhibiting a mirror loss to amplify the laser light for data communication, and iii) comprising a multilayer structure, the mirror loss being between 40 and 200 cm−1 in accordance with αm=(½L)ln{1/(Rf×Rb)}, where Rf is the first reflectance of the front facet and Rb is the second reflectance of the back facet, and the multilayer structure comprising
a P-layer,
an N-layer,
an N-doped active layer disposed between the P-layer and the N-layer and having undoped well layers, and
N-doped barrier layers alternating with the undoped well layers between the P-layer and the N-layer, the N-doped barrier layers having a width between 5 and 15 nm, and the undoped well layers having a width between 4 and 8 nm.