Hongmin Chen

US Patent:

7031354, Apr 18, 2006

Filed:

Feb 11, 2004

Appl. No.:

10/776809

Inventors:

Hsing Cheng - San Jose CA, US
Hongmin Chen - Acton MA, US
Hamid R. Khazaei - Westford MA, US

Assignee:

Optovia Corporation - Action MA

International Classification:

H01S 3/13

US Classification:

372 2902, 372 99

Abstract:

In a stabilized laser system, an output of a desired wavelength is generated. Each of a plurality of n lasers, which, while emitting light and having a preselected portion thereof fed back thereto, causes the fed back portion to be amplified and shifted in wavelength in a first direction which is spaced apart from the center wavelength of the feedback signal. A feedback stabilization arrangement is coupled to output ports of the plurality of n lasers for generating a feedback signal having a wavelength spectrum peaking at a wavelength shifted in an opposite direction to the first direction generated by the lasers in response to the feedback signal so as to provide an output signal at the output of the stabilized laser system having a wavelength spectrum that peaks essentially at the desired wavelength. A reflector is located at a predetermined signal round-trip time delay distance from the feedback stabilization arrangement. The reflector receives the output signal from the feedback stabilization arrangement and passes a first portion thereof therethrough, and reflects a remaining second portion back to the feedback stabilization arrangement as a secondary feedback signal that contributes to each of the plurality of n laser sources being set in a stable coherence collapse mode.

US Patent:

8260150, Sep 4, 2012

Filed:

Apr 25, 2008

Appl. No.:

12/110071

Inventors:

Daniel Mahgerefteh - Palo Alto CA, US
Hongmin Chen - Waltham MA, US
Bernd Huebner - Santa Clara CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H04B 10/04

US Classification:

398193, 398183, 398194, 398 79, 398199, 398201, 398195, 398196, 385 24, 385 37

Abstract:

An wave division multiplexed (WDM) optical transmitter is disclosed including a directly modulated laser array and a planar lightwave chip (PLC) having a plurality of OSRs that receive outputs of the laser array and increase the extinction ratio of the received light. An optical multiplexer receives the outputs of the OSRs and couples them to a single output port. The multiplexer has transmission peaks through its ports each having a 0. 5 dB bandwidth including the frequency of a laser in the array. The optical multiplexer may be embodied as cascaded Mach-Zehnder interferometers or ring resonators.

US Patent:

20090268765, Oct 29, 2009

Filed:

Apr 28, 2008

Appl. No.:

12/110572

Inventors:

Daniel Mahgerefteh - Palo Alto CA, US
Hongmin Chen - Mountain View CA, US
Yasuhiro Matsui - Woburn MA, US

International Classification:

H01S 5/06

US Classification:

372 28

Abstract:

Use of depletion edge translation as an in cavity phase modulation mechanism in lasers. Aspects of the invention are especially relevant (without limitation) in transmitters for extended reach comprising an intra cavity phase and amplitude modulated laser for generation of a frequency modulated signal and a passive optical spectrum reshaper element, sometimes referred to as a chirp modulated laser. Such techniques may be carried out as disclose herein by adopting predetermined doping profiles and applying predetermined voltage to the laser cavity, and more preferably to a phase section in or adjoining the laser cavity.

US Patent:

20190027896, Jan 24, 2019

Filed:

Sep 21, 2018

Appl. No.:

16/138648

Inventors:

- Shenzhen, CN
Hongmin Chen - Santa Clara CA, US
Hongbing Lei - Santa Clara CA, US
Xiao Andy Shen - Santa Clara CA, US

International Classification:

H01S 5/06
H01S 5/125
H01S 5/343

Abstract:

A wavelength tunable laser includes: a heating layer, a dielectric layer, reflectors, a transport layer, a support layer, and a substrate layer. The heating layer is located above the transport layer; the transport layer is located above the support layer, and the transport layer includes an upper cladding layer, a waveguide layer, and a lower cladding layer from top to bottom; the reflector is located in the transport layer; the support layer has a protection structure, where the protection structure forms a hollow structure together with the transport layer and the substrate layer, and the hollow structure has a support structure; and the substrate layer is located below the support layer. The heating layer, the reflector, and a part of the transport layer form a suspended structure to prevent heat dissipation. Thus thermal tuning efficiency can be improved, and power consumption can be lowered.

US Patent:

20180323578, Nov 8, 2018

Filed:

Jul 13, 2018

Appl. No.:

16/034471

Inventors:

- Shenzhen, CN
Hongmin CHEN - Santa Clara CA, US
Hongbing LEI - Santa Clara CA, US
Xiao Andy SHEN - Santa Clara CA, US

International Classification:

H01S 5/0683
H01S 5/026
H01S 5/06

Abstract:

A tunable laser is provided, including a first reflector, a second reflector, a phase adjustment area, a gain area, a first detector, a second detector, and a controller. The phase adjustment area is located between the first reflector and the gain area, the gain area is located between the phase adjustment area and the second reflector, a reflectivity of the first reflector is adjustable, and a reflectivity of the second reflector is adjustable. The first detector is configured to convert an optical signal of the first reflector into a first electrical signal. The second detector is configured to convert an optical signal of the second reflector into a second electrical signal. The controller is configured to adjust at least one of the reflectivity of the first reflector or the reflectivity of the second reflector based on the first electrical signal and the second electrical signal.

US Patent:

20180191128, Jul 5, 2018

Filed:

Dec 27, 2017

Appl. No.:

15/855334

Inventors:

- Shenzhen, CN
Hongmin CHEN - Santa Clara CA, US

International Classification:

H01S 5/026
G02B 6/42
G02B 6/12
G02B 6/125

Abstract:

Embodiments of the present disclosure relate to a surface-mount laser apparatus. One example apparatus includes an on-chip laser, a passive waveguide, and a waveguide detector. The waveguide detector includes a first ridge waveguide. The on-chip laser includes a second ridge waveguide. The on-chip laser is coupled with the passive waveguide by the second ridge waveguide, and the waveguide detector is coupled with the passive waveguide by the first ridge waveguide.

US Patent:

20170254954, Sep 7, 2017

Filed:

Mar 1, 2016

Appl. No.:

15/057638

Inventors:

- Plano TX, US
Qianfan Xu - San Jose CA, US
Rongsheng Miao - San Jose CA, US
Hongmin Chen - Davis CA, US
Xiao Shen - San Bruno CA, US
Yu Sheng Bai - Los Altos Hills CA, US

International Classification:

G02B 6/136
G02B 6/30
G02B 6/36
G02B 6/132

Abstract:

A method for fabricating a photonic integrated circuit (PIC) comprises providing a wafer comprising an insulator layer positioned between a top semiconductor layer and a base semiconductor layer, patterning the top semiconductor layer to simultaneously define a waveguide and a first etch mask window for forming a fiber-guiding v-groove that substantially aligns to an axis of optical signal propagation of the waveguide, removing a first portion of the top semiconductor layer to form the waveguide according to the patterning, removing a second portion of the top semiconductor layer to form the first etch mask window according to the patterning, and forming the fiber-guiding v-groove according to the first etch mask window.

US Patent:

20170244492, Aug 24, 2017

Filed:

Jan 24, 2017

Appl. No.:

15/414349

Inventors:

- Plano TX, US
Jianying Zhou - Acton MA, US
Xiao Shen - San Bruno CA, US
Chunlei Liao - San Jose CA, US
Hongbing Lei - San Jose CA, US
Hongmin Chen - Davis CA, US
Yu Sheng Bai - Los Altos Hills CA, US

International Classification:

H04B 10/564
H04B 10/079
H04L 7/00
H04B 10/516

Abstract:

An apparatus comprises: a first input tap; a first optical modulator coupled to the first input tap; a first output tap coupled to the first optical modulator so that the first optical modulator is positioned between the first input tap and the first output tap; and a controller indirectly coupled to the first input tap and the first output tap.