Optical design with integrated photonics
An optical assembly includes a number of laser integrated circuits operative for outputting a like number of optical or laser signals. A lightwave circuit is positioned to receive the optical or laser signals and is operative to phase shift the optical or laser signals, combine the phase shifted optical or laser signals, and output the phase shifted and combined optical or laser signals. A lens is positioned to receive, focus and output the phase shifted and combined optical or laser signals output by the lightwave circuit to a core of a fiber-optic cable.
1 . An optical assembly comprising:
a laser unit including a first side or edge emitting laser integrated circuit operative for outputting a first optical or laser signal and second side or edge emitting laser integrated circuit for outputting a second optical or laser signal;
a lightwave unit including a lightwave circuit disposed on or in or attached, bonded, or adhered to a top surface of a substrate positioned to receive, without reflection, the first optical signal and the second optical signal, the lightwave circuit including
means for producing a phase shift between the first optical signal and the second optical signal,
means for combining the phase shifted first optical signal and second optical signal, and
means for outputting the phase shifted and combined first optical signal and second optical signal; and
an optical unit including a lens for focusing the phase shifted and combined first optical signal and second optical signal output by the means for outputting the phase shifted and combined first optical signal and second optical signal, and for outputting the focused and phase shifted combined first optical signal and second optical signal to a core of a fiber-optic cable that is not part of the optical assembly.
2 . The optical assembly of claim 1 , wherein the means for outputting the phase shifted and combined first optical signal and second optical signal is an optical waveguide.
3 . The optical assembly of claim 1 , wherein the optical unit includes an optical isolator in a path of the focused and phase shifted combined first optical signal and second optical signal between the lens and the core of the fiber-optic cable.
4 . The optical assembly of claim 1 , wherein the lightwave unit includes the substrate supported atop of a base substrate.
5 . The optical assembly of claim 4 , wherein the lightwave unit includes a cap substrate positioned atop of at least a portion of the substrate on which the lightwave circuit is disposed on or in or attached, bonded, or adhered to.
6 . The optical assembly of claim 1 , wherein the laser unit includes a substrate unit, a shim unit, or both supporting the first laser integrated circuit and the second laser integrated circuit with their respective optical outputs aligned with inputs of first and second input optical waveguides of the lightwave circuit which are optically coupled to the means for producing the phase shift between the first optical signal and the second optical signal.
7 . The optical assembly of claim 6 , further including means for detecting portions of the first and second optical signals travelling in the first and second input optical waveguides of the lightwave circuit and for outputting first and second electrical signals related to the detected portions of the first and second optical signals travelling in the first and second input optical waveguides.
8 . The optical assembly of claim 6 , wherein:
the shim unit comprises first and second shims for the first laser integrated circuit and the second laser integrated circuit;
the first laser integrated circuit is positioned atop of the first shim; and
the second laser integrated circuit is positioned atop of the second shim.
9 . The optical assembly of claim 1 , wherein the lightwave circuit includes:
first and second input optical waveguides positioned to receive input optical signals output by the first laser integrated circuit and the second laser integrated circuit and to provide said input optical signals to the means for producing the phase shift between the first optical signal and the second optical signal; and
first and second photodiodes positioned to detect portions of the input optical signals travelling in the first and second input optical waveguides and for outputting first and second electrical signals related to the detected first and second input optical signals travelling in the first and second input optical waveguides.
10 . The optical assembly of claim 1 , wherein the substrate includes a cantilever portion that extends toward the first and second laser integrated circuits and defines under the cantilever portion a gap or space between a side of the substrate on which the lightwave circuit is disposed on or in or attached, bonded, or adhered to and a side of one or more substrates, or shims, or both of the laser unit that support the first and second laser integrated circuits.
11 . The optical assembly of claim 10 , wherein a distal end of the cantilever portion and sides of the first and second laser integrated circuits are spaced from each other by another gap or space.
12 . The optical assembly of claim 10 , wherein:
the laser unit includes first and second modulators in paths of the first and second optical or laser signals output by the first and second laser integrated circuits; and
a distal end of the cantilever portion and sides of the first and second modulators are spaced from each other by another gap or space.
13 . The optical assembly of claim 10 , further including an adhesive disposed in the gap or space.
14 . An optical assembly comprising:
a plurality of side or edge emitting laser integrated circuits operative for outputting a like plurality of optical or laser signals;
a lightwave circuit disposed on or in or attached, bonded, or adhered to a top surface of a substrate and positioned to receive, without reflection, the plurality of optical or laser signals, the lightwave circuit operative to phase shift the plurality of optical or laser signals, combine the phase shifted plurality of optical or laser signals, and output the phase shifted and combined plurality of optical or laser signals; and
a lens positioned to receive, focus and output the phase shifted and combined plurality of optical or laser signals output by the lightwave circuit to a core of a fiber-optic cable.
15 . The optical assembly of claim 14 , further including an optical isolator in a path of the focused, phase shifted and combined plurality of optical or laser signals output by the lightwave circuit between the lens and the core of the fiber-optic cable.
16 . The optical assembly of claim 14 , wherein:
the plurality of laser integrated circuits are supported by a substrate unit, a shim unit, or both; and
the lens is supported by a housing.
17 . The optical assembly of claim 16 , wherein the lightwave circuit substrate includes a cantilever portion that extends toward the plurality of laser integrated circuits and a gap or space under the cantilever portion between a side of the lightwave circuit substrate under the cantilever portion and a side of the substrate unit, the shim unit, or both.
18 . The optical assembly of claim 17 , wherein the substrate unit, the shim unit, or both includes one or more substrates or shims supporting the plurality of laser integrated circuits.
19 . The optical assembly of claim 17 , wherein a distal end of the cantilever portion and sides of the plurality of laser integrated circuits are spaced from each other by another gap or space.
20 . The optical assembly of claim 17 , further including:
a plurality of modulators in paths of the plurality of optical or laser signals output by the plurality of laser integrated circuits; and
a distal end of the cantilever portion and sides of the plurality of modulators are spaced from each other by another gap or space.
21 . The optical assembly of claim 17 , further including an adhesive disposed in the gap or space.
22 . The optical assembly of claim 16 , further including at least one of the following:
the lightwave circuit substrate formed on, supported by, or positioned atop of a base substrate; and
a cap substrate positioned atop of at least a portion of the lightwave circuit substrate.