Optically controlled optical switching module, method of optically controlling an optical switching network, and optical switching network

• US 5,739,933 A
• Filed: 05/28/1996
• Issued: 04/14/1998
• Est. Priority Date: 06/02/1995
• Status: Expired due to Fees

• Current Assignee: Alcatel NV (Nokia Corporation)
• Original Assignee: Alcatel NV (Nokia Corporation)
• Inventors: Schmitz, Jorg, Dembeck, Lars, Lach, Eugen
• Primary Examiner(s): PASCAL, LESLIE C
• Application Number:
  US08/653,539
• Time in Patent Office: 686 Days
• Field of Search: 359/117, 359/128, 359/139, 359/158, 359/176, 359/179
• US Class Current: 398/45
• CPC Class Codes: H04Q 11/0003 Details
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 2011/0041 Optical control

Abstract

The invention concerns an optically controlled optical switching module (SM1), as well as a method of optically controlling an optical switching network, and an optical switching network. The optical switching module (SM1) is equipped with at least one optical switch (OCOSW), which is controlled through an optical control input (CONTR), which switches a useful optical signal. The optical switching module (SM1) furthermore has an optical pulse shaper (PW) that is connected to this control input (CONTR), which produces switching pulses that are suitable for the optical switch (OCOSW), from an optical control signal. The optical switching network contains at least one optical switching module (SM1). Control bits from an optical data packet are individually masked out in the optical switching network by means of optical switches (OSW), and the optical control signals corresponding to the respective control bits (CB1 to CB4) are fed to one of the optical pulse shapers (PW).

Claims

1. An optically controlled optical switching module (SM1 to SM4;

SM'"'"'), wherein the optical switching module (SM1 to SM4;

SM'"'"') comprises at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) for switching an optical intelligence signal, said optical switch being controllable via an optical control input (CONTR), and an optical pulse shaper (PW;

PW11 to PW22) connected to said control input (CONTR) for providing switching pulses for the at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) from an optical control signal, characterized in that the pulse shaper (PW;

PW11 to PW22) is a laser with saturable absorber.

2. An optically controlled optical switching module as claimed in claim 1, characterized in that the optical switch (OCOSW;

OCOSW11 to OCOSW22) is a Mach-Zehnder interferometer.

3. An optically controlled optical switching module (SM1 to SM4;

SM'"'"'), wherein the optical switching module comprises at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) for switching an optical intelligence signal, said optical switch being controllable via an optical control input (CONTR), and an optical pulse shaper (PW;

PW11 to PW22) connected to said control unit (CONTR) for providing switching pulses for the at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) from an optical control signal, characterized in that the switching module (SM1 to SM4;

SM'"'"') comprises a further optical switch (OSW;

OSW 11 to OSW22) for masking control bits (CB1 to CB4) out of the intelligence signal, which comprises a sequence of data packets (DP), and that the further optical switch (OSW;

OSW11 to OSW22) is connected to the optical pulse shaper (PW;

PW11 to PW22) for providing the masked-out control bits (CB1 to CB4) as control signals thereto.

4. An optically controlled optical switching module as claimed in claim 3, characterized in that the pulse shaper (PW;

PW11 to PW22) is a laser with saturable absorber.

5. A method of optically controlling an optical switching network (SN) which serves to switch optical data packets (DP), characterized in that control bits (CB1 to CB4) of an optical data packet (DP) are individually optically masked out by means of optical switches (OSW;

OSW11 to OSW22), that optical control signals corresponding to the respective control bits (CB1 to CB4) are provided to respective optical pulse shapers (PW;

PW11 to PW22) which in response thereto provide optical switching pulses therefrom, and that the optical switching pulses each control at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) which serves to switch the data packet (DP).

6. A method as claimed in claim 5, characterized in that the control bits (CB1 to CB4), which are present in serial form, are converted to parallel form by means of optical delay elements (D1, D2) before being provided to the optical pulse shapers (PW11 to PW22).

7. A method as claimed in claim 5, characterized in that the optical switching network (SN) is constructed from a plurality of optical switching modules (SM1 to SM4) which each mask only a single control bit (CB1 to CB4) out of the data packet (DP).

8. An optical switching network (SN) comprising at least one optically controlled optical switching module (SM1 to SM4;

SM'"'"'), wherein the optical switching module (SM1 to SM4;

SM'"'"')comprises at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) for switching an optical intelligence signal, said optical switch being controllable via an optical control input (CONTR), and an optical pulse shaper (PW;

PW11 to PW22) connected to said control unit (CONTR) for providing switching pulses for the at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) from an optical control signal, characterized in that the pulse shaper (PW;

PW11 to PW22) is a laser with saturable absorber.

9. An optical switching network (SN) comprising at least one optically controlled optical switching module (SM1 to SM4;

SM'"'"'), wherein each optical switching module (SM1 to SM4;

SM'"'"') comprises at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) for switching an optical intelligence signal, said optical switch being controllable via an optical control input (CONTR), and an optical pulse shaper (PW;

PW11 to PW22) connected to said control input (CONTR) for providing switching pulses for the at least one optical switch (OCOSW;

OCOSW11 to OCOSW22) from an optical control signal, characterized in that the switching module (SM1 to SM4;

SM'"'"') comprises a further optical switch (OSW;

OSW11 to OSW22) for masking control bits (CB1 to CB2) out of the intelligence signal, which comprises a sequence of data packets (DP), and that the further optical switch (OSW;

OSW11 to OSW22) is connected to the optical pulse shaper (PW;

PW11 to PW22) for providing the masked-out control bits (CB1 to CB4) as control signals thereto.

10. An optical switching network (SN) as claimed in claim 9, characterized in that the pulse shaper (PW;

PW11 to PW22) is a laser with saturable absorber.