Patent ID: 7957618

Claim:
An integrated photonic circuit comprising waveguides ( 12 - 19 ) and other photonic components, wherein, the photonic circuit has a first part ( 1 ) and a second part ( 2 ), the first part and the second part are connected to a mirror in the form of a half 2×2 multimode interferometer (MMI) ( 32 ), which comprises solely one half MMI ( 31 ) in a longitudinal direction, said half MMI ( 32 ) has two ports ( 33 , 34 ) and is arranged to reflect half of the light that is incident on one of the ports to one port and transmit half of the incident light to the second port, and the free surface ( 35 ) of said half MMI ( 32 ) has been treated with a highly reflective material, the first part is a laser ( 1 ) and the second part is a Mach-Zender interferometer ( 2 ), wherein the laser comprises at least one reflector ( 3 ), a phase section ( 4 ) and an amplifier section ( 5 ), which sections are arranged subsequent to each other on a support ( 6 ) with the first, light-emitting, end of the laser ( 1 ) pointing in a first direction, and said Mach-Zender interferometer ( 2 ) is arranged on said support material ( 6 ) next to said laser ( 1 ) with the first, light-emitting, end of the interferometer ( 2 ) pointing in a second direction, wherein said second direction is opposite to said first direction, and said half MMI ( 32 ) is located between the first, light-emitting, end of the laser ( 1 ) and the second, light-receiving, end of the interferometer ( 2 ), said laser ( 1 ) is a tuneable laser, and said laser ( 1 ) comprises two Bragg reflectors ( 20 , 21 ) on the same side of the laser and connected through a splitter ( 22 ) to the phase section ( 4 ), which is connected to the amplifier section ( 5 ).