Finisar Corporation

Ii-vi Delaware, Inc.

Cisco Technology, Inc.

Bernd Huebner

Xiaojie Xu

Daniel Mahgerefteh

Jianxiao Chen

Tengda Du

Yasuhiro Matsui

Bryan Park

Gilles P Denoyer

Yuheng Lee

Yan Yang Zhao

Jianying Zhou

Charles B Roxlo

David Adams

Christopher R Cole

Shiyun Lin

Jin-Hyoung Lee

Hongmin Chen

Tsurugi Sudo

The′ Linh Nguyen

The' Linh Nguyen

Rafik Ward

Martin Huibert Kwakernaak

Philippe Jenneve

A system and method for compensating a frequency shift of an optical communication signal may include a tunable receiver laser, a coherent optical receiver that receives the optical communication signal, in which the coherent optical receiver can demodulate the optical communication signal based on an optical output of the tunable receiver laser, a trans-impedance amplifier that receives a demodulated signal from the coherent optical receiver and generates an amplifier output, a laser tracking system that generates a laser tuning signal configured to adjust the optical output of the tunable receiver laser, and a controller including a processor and a memory unit. The memory unit includes instructions that cause the controller to receive the amplifier output, calculate a frequency spectrum of the amplifier output, and determine an offset of a frequency of the optical communication signal from a first frequency of the optical output.

Systems and methods of compensating for frequency offsets in optical communications

An optoelectronic assembly may include a photonic integrated circuit (PIC) with a top surface and a laser with a top surface and a bottom surface. The optoelectronic assembly may also include a housing configured to cooperate with the PIC to one or both of house and support one or more components. The housing may include a PIC mount including a first surface to interface with the top surface of the PIC, and a laser mount including a second surface to interface with the top or bottom surface of the laser. The first surface and the second surface may be parallel to each other.

Lens-less laser micro-package assembly

Multichannel RF Feedthroughs. In some examples, a multichannel RF feedthrough includes an internal portion and an external portion. The internal portion includes a top surface on which first and second sets of traces are formed. Each set of traces is configured as an electrical communication channel to carry electrical data signals. The external portion includes a bottom surface on which the first set of traces is formed and a top surface on which the second set of traces is formed. A set of vias connects the first set of traces between the top surface of the internal portion and the bottom surface of the external portion.

Multichannel RF feedthroughs

A system includes a surface coupled edge emitting laser that includes a core waveguide, a fan out region optically coupled to the core waveguide in a same layer of the surface coupled edge emitting laser as the core waveguide; and a first surface grating formed in the fan out region; and a photonic integrated circuit (PIC) that includes an optical waveguide and a second surface grating formed in an upper layer of the PIC, wherein the second surface grating is in optical alignment with the first surface grating.

Surface coupled systems

An embodiment includes an optical transmitter. An optical transmitter may include a primary laser for transmitting a primary optical signal and a backup laser for transmitting a backup optical signal. The optical transmitter may further include a photonic integrated circuit (PIC). The PIC may include at least one input port configured to receive the primary optical signal from the primary laser and the backup optical signal from the backup laser. The PIC may also include at least one output port configured to receive each of the primary optical signal and the backup optical signal. The optical transmitter may be configured to activate the backup laser upon determining that the primary laser has failed or is failing.

Light source redundancy in optical communication devices

In an example, a photonic system and method include a photonic integrated circuit (PIC) including a silicon (Si) waveguide and a first silicon nitride (SiN) waveguide. The system also includes an interposer including a second SiN waveguide including vertical tapers on the second SiN waveguide by increasing a thickness of the second SiN waveguide in a direction toward the first SiN waveguide to allow an adiabatic optical mode transfer and decreasing the thickness of the second SiN waveguide in a direction away from the first SiN waveguide to inhibit the optical mode transfer.

Adiabatically coupled photonic systems with vertically tapered waveguides

In an example, a photonic system includes a Si PIC with a Si substrate, a SiObox formed on the Si substrate, a first layer, and a second layer. The first layer is formed above the SiObox and includes a SiN waveguide with a coupler portion at a first end and a tapered end opposite the first end. The second layer is formed above the SiObox and vertically displaced above or below the first layer. The second layer includes a Si waveguide with a tapered end aligned in two orthogonal directions with the coupler portion of the SiN waveguide such that the tapered end of the Si waveguide overlaps in the two orthogonal directions and is parallel to the coupler portion of the SiN waveguide. The tapered end of the SiN waveguide is configured to be adiabatically coupled to a coupler portion of an interposer waveguide.

Two-stage adiabatically coupled photonic systems

A transceiver system may include a laser and a silicon optical grating. The laser may be configured to emit a laser beam at an output of the laser. The laser beam may have a non-circular elliptical mode profile. The silicon grating may be configured to exhibit a mode profile having a shape corresponding to the non-circular elliptical mode profile of the laser beam.

Optical grating

In an example, a coupled system includes a first waveguide, at least one second waveguide, and an interposer. The first waveguide has a silicon (Si) core having first refractive index n1 and a tapered end. The at least one second waveguide each has a silicon nitride (SiN) core having a second refractive index n2. The interposer includes a third waveguide having a third refractive index n3 and a coupler portion, where n1&#x3e;n2&#x3e;n3. The tapered end of the first waveguide is adiabatically coupled to a coupler portion of one of the at least one second waveguide. A tapered end of one of the at least one second waveguide is adiabatically coupled to the coupler portion of the third waveguide of the interposer. The third waveguide of the interposer has an optical mode size that is similar to the mode size of a standard single mode optical fiber.

In an embodiment, a delay line interferometer (DLI) multiplexer (MUX) includes a first stage and a second stage. The first stage includes a first DLI and a second DLI. The first DLI includes a first left input, a first right input, and a first output and has a free spectral range (FSR) that is about four times a nominal channel spacing. The second DLI includes a second left input, a second right input, and a second output and has an FSR that is about four times the nominal channel spacing. The second stage is coupled to the first stage and includes a third DLI. The third DLI includes a third left input optically coupled to the first output, a third right input optically coupled to the second output, and a third output. An FSR of the third DLI is about two times the nominal channel spacing.

Delay line interferometer multiplexer

In an example, a coupled system includes a first waveguide, at least one second waveguide, and an interposer. The first waveguide has a first refractive index n1 and a tapered end. The at least one second waveguide each has a second refractive index n2. The interposer includes a third waveguide having a third refractive index n3 and a coupler portion, where n1&#x3e;n2&#x3e;n3. The tapered end of the first waveguide is adiabatically coupled to a coupler portion of one of the at least one second waveguide. A tapered end of one of the at least one second waveguide is adiabatically coupled to the coupler portion of the third waveguide of the interposer. The coupled system is configured to adiabatically couple light between the first waveguide and the at least one second waveguide and between the at least one second waveguide and the third waveguide.

Multi-laser transmitter optical subassembly (TOSA). In one example embodiment, a method of fabricating a multi-laser TOSA includes various acts. First, first and second optical signals are transmitted from first and second lasers, respectively. Next, the angle of a first collimating lens is actively adjusted to cause the second optical signal to be aligned with the first optical signal as the first optical signal passes through a first filter and as the second optical signal is reflected by the first filter such that the first and second optical signals are aligned and combined.

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Mountain View, CA, United States of America

Bernd Huebner