1. An assembly comprising:
a first laser diode that produces a first beam, the first laser diode being part of a first chip on a submount (COS) that is mounted to a flat surface;
a second laser diode that produces a second beam, the second laser diode being part of second COS that is adjacent to the first COS and is mounted to the flat surface;
a first collimating assembly that collimates the first beam to form a first collimated beam, wherein the first collimated beam has a first spatial beam profile;
a second collimating assembly that collimates the second beam to form a second collimated beam that is parallel to the first collimated beam, wherein the second collimated beam has a second spatial beam profile;
a first redirecting device that adds a vertical offset to the first collimated beam, changes the direction of propagation of the first collimated beam and rotates the first spatial beam profile of the first collimated output beam by 90 degrees such that the first spatial beam profile has a first vertical elongated side; and
a second redirecting device, positioned such that second redirecting device is staggered laterally from the first redirecting device, that adds the vertical offset to the second collimated beam, changes the direction of propagation of the second collimated beam such that the second collimated beam is parallel to the first collimated beam exiting the first redirecting device, and rotates the second spatial beam profile of the second collimated output beam by 90 degrees such that the second spatial beam profile has a second vertical elongated side adjacent to the first vertical elongated side, and
wherein the first and second collimated beams exiting the first and second redirecting devices create a first stacked beam.
2. The assembly of claim 1, wherein the first redirecting device comprises:
a mounting surface that attaches the first redirecting device to the flat surface;
a entrance surface that transmits the first collimated beam output from the first collimating assembly;
a first reflecting surface that reflects the first collimated beam such that it is propagating in a vertical direction; and
a second reflecting surface that reflects the first collimated beam reflected by the first reflecting surface such that the first collimated beam is traveling in a direction orthogonal to the direction of beam propagation output from the first collimating assembly.
3. The assembly of claim 2, wherein the first redirecting device comprises:
a block including the mounting surface;
a first right angle prism wherein the hypotenuse of the first right angle prism is the first reflecting surface, the first right angle prism being affixed to the block such that the collimated beam exiting the block enters the first right angle prism and reflects off the first reflecting surface; and
a second right angle prism wherein the hypotenuse of the second right angle prism is the second reflecting surface, the second right angle prism being affixed to the first fight angle prism such that the collimated beam exiting the first right angle prism enters the second right angle prism and reflects off the second reflecting surface.
4. The assembly of claim 3, wherein the block, the first right angle prism, and the second right angle prism form a monolithic structure.
5. The assembly of claim 3, wherein the block and the first right angle prism form a monolithic structure.
6. The assembly of claim 2, wherein the first redirecting device comprises:
a modified right angle prism having a 45\xb0 cut out between a triangular face of the modified right angle prism and the bottom of the modified right angle prism to create the first reflecting surface, and the hypotenuse of the modified right angle prism acts as the second reflecting surface.
7. The assembly of claim 2, further comprising:
a focusing lens that couples the first stacked beam to a fiber; and
wherein the first redirecting device is closer to the focusing lens than the second redirecting device and the second redirecting device is offset by a distance equal to the offset between the first and collimated beams in the first stacked beam.
8. The assembly of claim 7, further comprising:
a half-wave plate that changes the polarization of the first stacked beam by 90 degrees such that the polarization of the first stacked beam is orthogonal to a polarization of a second stacked beam;
a polarization beam combiner that combines the first stacked beam exiting the half-wave plate with the second stacked beam to create a combined beam, wherein the combined beam is then coupled to the fiber via the focusing lens.
9. An assembly comprising:
a first laser diode that produces a first beam, the first laser diode being part of a first chip on a submount (COS) that is mounted to a flat surface;
a second laser diode that produces a second beam, the second laser diode being part of a second COS that is adjacent to the first COS and is mounted to the flat surface;
a first collimating assembly that collimates the first beam to form a first collimated beam, wherein the first collimated beam has a first horizontal spatial beam profile with a first horizontal elongated side;
a second collimating assembly that collimates the second beam to form a second collimated beam that is parallel to the first collimated beam, wherein the second collimated beam has a second horizontal spatial beam profile with a second horizontal elongated side;
a first redirecting device that changes the direction of propagation of the first collimated beam; and
a second redirecting device, that adds a vertical offset to the second collimated beam and changes the direction of propagation of the second collimated beam such that the second collimated beam is parallel to the first collimated beam exiting the first redirecting device and the second horizontal elongated side is adjacent to the first horizontal elongated side,
wherein the first and second collimated beams exiting the first and second redirecting devices create a first stacked beam.
10. The assembly of claim 9, further comprising:
a focusing lens that couples the first stacked beam to a fiber; and
wherein the first redirecting device is closer to the focusing lens than the second redirecting device.
11. The assembly of claim 10, further comprising:
a half-wave plate that changes the polarization of the first stacked beam by 90 degrees such that the polarization of the first stacked beam is orthogonal to a polarization of a second stacked beam;
a polarization beam combiner that combines the first stacked beam exiting the half-wave plate with the second stacked beam to create a combined beam, wherein the combined beam is then coupled to the fiber via the focusing lens.
12. The assembly of claim 11, further comprising:
a feedback isolation filter that transmits the combined beam and attenuates a feedback signal from the fiber.
13. The assembly of claim 10, wherein the first redirecting device is a mirror.
14. The assembly of claim 10, wherein the first redirecting device is an Amici roof prism.
15. The assembly of claim 14, wherein the second redirecting device is an Amici roof prism with different dimensions than the first Amici roof prism.
16. A modified right angle prism comprising:
a beam entering surface that is triangular in shape, the beam entering surface including a first edge that is perpendicular to a bottom surface of the modified right angle prism, wherein a collimated beam perpendicular to, and incident on, the beam entering surface is transmitted by the beam entering surface;
a first reflecting surface that is a 45\xb0 cut out between a far side surface and a bottom surface of the modified right angle prism, wherein the far side surface is parallel to the beam entering surface;
a second reflecting surface that is the hypotenuse of the modified right angle prism, wherein the collimated beam reflects off the first reflecting surface and then the second reflecting surface, adding a vertical offset to the collimating beam and rotating the collimated beam such that a spatial beam profile of the collimated beam is rotated by 90 degrees; and
a beam exiting surface, rectangular in shape, that transmits the collimated beam reflected from the second reflecting surface, the beam exiting surface intersects the beam exiting surface at the first edge.
17. The modified right angle prism of claim 16, wherein the modified right angle prism is a monolithic structure.
18. The modified right angle prism of claim 16, wherein the first edge is located to the right of the collimated beam incident on the beam entering surface.
19. The modified right angle prism of claim 16, wherein the first edge is located to the left of the collimated beam incident on the beam entering surface.
20. The modified right angle prism of claim 16, wherein at least one of the first reflecting surface or the second reflecting surface is coated to increase reflectivity.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method for sending a secure e-mail, comprising the steps of:
(a) composing an e-mail message by a sender, wherein said e-mail message includes a body field and at least one receiver field containing at least one receiver id representing at least one intended receiver;
(b) providing a sender id, a sender password, and all said receiver ids to a security server;
(c) receiving a message key and a message id which is unique for said e-mail message from said security server;
(d) encrypting said body field of said e-mail message based on said message key and enclosing said message id therewith to form the secure e-mail;
(e) mailing said secure e-mail in conventional manner to said receivers; and
(f) storing said message id, said message key, and all said receiver ids at said security server, to allow said security server to provide said message key to said receivers so that they may decrypt and read the secure e-mail.
2. The method of claim 1, wherein:
in said step (a) said e-mail message further includes a subject field; and
said step (d) includes encrypting said subject field.
3. The method of claim 1, wherein said sender id is associated with an e-mail address for said sender.
4. The method of claim 1, wherein said sender password is derived from a private password provided by said sender, to permit said sender to maintain said private password as private.
5. The method of claim 1, wherein said sender password has been previously stored for said sender.
6. The method of claim 1, further comprising authenticating said sender based on said sender id and said sender password after said step (b) and prior to proceeding with said step (c).
7. The method of claim 1, wherein said step (d) encrypts using a symmetric key encryption algorithm.
8. The method of claim 1, wherein:
said step (e) includes mailing to at least one said receiver which is a receiver list; and the method further comprising:
resolving said receiver list into a plurality of said receiver ids for said security server, to allow said security server to provide said message key to instances of said receivers which are members of said receiver list.
9. The method of claim 1, further comprising:
said step (b) includes providing a message hash based on said e-mail message to said security server; and
said step (c) includes receiving a first message seal from said security server based on said message hash; and
said step (d) includes enclosing the first message seal with the secure e-mail, to permit said security server comparing said first message seal with a second message seal taken from the secure e-mail as received to determine whether the secure e-mail has been altered while in transit to said receiver.
10. The method of claim 1, wherein at least one of said steps (b) and (c) employs secure socket layer protocol in communications with said security service.
11. A method for receiving a secure e-mail, comprising the steps of:
(a) accepting the secure e-mail by a receiver, wherein the secure e-mail includes a body field that is encrypted and a message id that uniquely identifies the secure e-mail;
(b) providing said message id as well as a receiver id and a receiver password for said receiver to a security server;
(c) receiving a message key from said security server; and
(d) decrypting the secure e-mail based on said message key, to form an e-mail message which is readable by said receiver.
12. The method of claim 11, wherein:
in said step (a) said secure e-mail further includes a subject field that is also encrypted; and
said step (d) includes decrypting said subject field.
13. The method of claim 11, wherein said receiver id is associated with an e-mail address for said receiver.
14. The method of claim 11, wherein said receiver password is derived from a private password provided by said receiver, to permit said receiver to maintain said private password as private.
15. The method of claim 11, wherein said receiver password has been previously stored for said receiver.
16. The method of claim 11, further comprising authenticating said receiver based on said receiver id and said receiver password after said step (b) and prior to proceeding with said step (c).
17. The method of claim 11, wherein said step (d) decrypts using a symmetric key decryption algorithm.
18. The method of claim 11, wherein:
the secure e-mail was sent by a sender and a first message seal based on the secure e-mail before it left control of said sender is stored by said security server;
said step (b) further includes also providing to said security server a second message seal which is taken from the secure e-mail as received by said receiver; and
said step (c) includes receiving an indication from said security server whether said first message seal and said second message seal match, to determine whether the secure e-mail was altered in transit.
19. The method of claim 11, wherein at least one of said steps (b) and (c) employs secure socket layer protocol in communications with said security service.
20. A system for communicating an e-mail message securely between a sender and a receiver, the system comprising:
a sending unit that composes the e-mail message for the sender, wherein the e-mail message includes a body field and a receiver field containing a receiver id representing the receiver;
said sending unit including a logic that provides a sender id, a sender password, and said receiver id to a security server;
said security server including a logic that replies to said sending unit with a message id, which is unique for the e-mail message, and a message key;
said security server further including a logic that stores said message id, said message key, and said receiver id;
said sending unit further including a logic that encrypts the e-mail message based on said message key and encloses said message id therewith to form a secure e-mail;
said sending unit yet further including a logic that e-mails said secure e-mail in conventional manner to the receiver;
a receiving unit that accepts said secure e-mail;
said receiving unit including a logic that provides said message id, said receiver id and a receiver password to said security server;
said security server yet further including a logic that replies to said receiving unit with said message key for said secure e-mail;
said security server still further including a logic that decrypts said secure e-mail based on said message key into the e-mail message such that it is readable by the receiver.